Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2011
Leases, Related Party Transactions and Other Commitments [Abstract]          
Number of facilities covered under capital lease arrangements 4   4    
Capital lease obligations $ 6,500,000   $ 6,500,000    
Number of facilities covered under capital lease obligations to related parties 4   4    
Capital Lease Obligations, Number of Lease Renewal Options 2   2    
Capital Lease Rent Expense, Base Rent Amount     854,000    
Capital Lease, Description of Rent Escalation    
Beginning in year five, the rent amount will increase by the greater of the Consumer Price Index ("CPI") increase during the first four-year period or 12%.  For each successive lease year, the rent will increase based on any increase in the CPI for the previous lease year.
   
Purchase Option Price for Three Facilities Under Capital Lease 9,000,000   9,000,000    
Purchase Option Price for Fourth Facility Under Capital Lease 650,000   650,000    
Depreciation expense, capital leases 112,000   336,000    
Interest expense, capital leases 177,000   529,000    
Capitalized construction costs 27,300,000   27,300,000    
Depreciation expense related to building 482,000   804,000    
Interest expense related to building 444,000   740,000    
Contingencies [Abstract]          
Number of periods covered under work share agreement 2   2    
Escrow deposit relating to work share agreement         1,500,000
Expense recorded related to the work share agreement   $ 750,000   $ 750,000