Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

v2.4.0.6
Commitments and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 01, 2012
Lease Obligations [Line Items]                  
Number of land parcels purchased 5                
Number of buildings on land parcels 4                
Purchase price for land parcel and buildings $ 8,800,000         $ 8,800,000      
Number of facilities under capital lease 4         4      
Capital lease obligations 6,600,000         6,600,000      
Number of lease renewal options 2         2      
Term of Renewal Options           7 years      
Base rent amount           854,000      
Depreciation expense, capital leases           411,000 266,000    
Interest expense, capital leases           646,000 484,000    
Estimated useful life           15 years      
Operating Leases, Rent, Net [Abstract]                  
Operating lease expense           11,544,000 11,787,000 13,209,000  
Sublease income           671,000 770,000 808,000  
Net expense           10,873,000 11,017,000 12,401,000  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]                  
Operating Leases, Lease Commitments Due in 2013 7,960,000         7,960,000      
Operating Leases, Lease Commitments Due in 2014 6,108,000         6,108,000      
Operating Leases, Lease Commitments Due in 2015 2,087,000         2,087,000      
Operating Leases, Lease Commitments Due in 2016 1,194,000         1,194,000      
Operating Leases, Lease Commitments Due in 2017 1,051,000         1,051,000      
Operating Leases, Lease Commitments Due Thereafter 0         0      
Operating Leases, Lease Commitments Due Total 18,400,000         18,400,000      
Operating Leases, Future Minimum Payments Receivable [Abstract]                  
Operating Leases, Sublease Income Due in 2013 461,000         461,000      
Operating Leases, Sublease Income Due in 2014 286,000         286,000      
Operating Leases, Sublease Income Due in 2015 48,000         48,000      
Operating Leases, Sublease Income Due in 2016 0         0      
Operating Leases, Sublease Income Due in 2017 0         0      
Operating Leases, Sublease Income Due Thereafter 0         0      
Operating Leases, Sublease Income Due Total 795,000         795,000      
Operating Leases, Future Minimum Payments, Net Commitments [Abstract]                  
Operating Leases, Net Commitments Due in 2013 7,499,000         7,499,000      
Operating Leases, Net Commitments Due in 2014 5,822,000         5,822,000      
Operating Leases, Net Commitments Due in 2015 2,039,000         2,039,000      
Operating Leases, Net Commitments Due in 2016 1,194,000         1,194,000      
Operating Leases, Net Commitments Due in 2017 1,051,000         1,051,000      
Operating Leases, Net Commitments Due Thereafter 0         0      
Operating Leases, Net Commitments Due Total 17,605,000         17,605,000      
Capital Leases, Lease Commitments [Abstract]                  
Capital Leases, Lease Commitments Due in 2013 3,755,000         3,755,000      
Capital Leases, Lease Commitments Due in 2014 3,868,000         3,868,000      
Capital Leases, Lease Commitments Due in 2015 3,985,000         3,985,000      
Capital Leases, Lease Commitments Due in 2016 4,104,000         4,104,000      
Capital Leases, Lease Commitments Due in 2017 4,221,000         4,221,000      
Capital Leases, Lease Commitments Due Thereafter 45,240,000         45,240,000      
Capital Leases, Lease Commitments, Total 65,173,000         65,173,000      
Capitalization of Construction Costs 27,300,000         27,300,000 26,400,000   27,300,000
Long term Construction Costs Liability                 27,300,000
Contingencies [Abstract]                  
Number of subcontractors that operated the facility       1          
Number of deaths of subcontractor employees       5          
Number of periods covered under work share agreement         2        
Period of subcontracted work         9 years        
Expense recorded related to the work share agreement   $ 750,000 $ 750,000            
Building and Building Improvements [Member]
                  
Lease Obligations [Line Items]                  
Estimated useful life           15 years      
Building Facilities [Member]
                  
Lease Obligations [Line Items]                  
Term of Lease           15 years      
Operating Leases [Member] | Minimum [Member]
                  
Lease Obligations [Line Items]                  
Term of Lease           2 years      
Operating Leases [Member] | Maximum [Member]
                  
Lease Obligations [Line Items]                  
Term of Lease           15 years