Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v2.4.0.8
Debt (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Jun. 30, 2013
Base Rate [Member]
Jun. 30, 2013
LIBOR [Member]
Jun. 30, 2013
Term loan [Member]
Jul. 31, 2011
Term loan [Member]
Jun. 30, 2013
Term loan [Member]
July 2011 to June 2012 [Member]
Jun. 30, 2013
Term loan [Member]
July 2012 to June 2014 [Member]
Debt Instrument [Line Items]                        
Debt Instrument, Maturity Date         Jun. 30, 2016              
Financing costs         $ 1,700,000              
Amortization period of debt issuance costs         5Y              
Borrowings outstanding 71,900,000   71,900,000     92,200,000            
Term loan payments 2013 12,500,000   12,500,000                  
Term loan payments 2014 25,000,000   25,000,000                  
Term loan payments 2015 34,400,000   34,400,000                  
Revolving loans maximum borrowing capacity 125,000,000   125,000,000                  
Revolving loans potential increment in maximum borrowing capacity     175,000,000                  
Revolving loans amount outstanding 46,900,000   46,900,000     48,000,000            
Letters of credit outstanding 573,000   573,000     1,300,000            
Debt outstanding 118,800,000   118,800,000     140,200,000            
Base margin (in hundredths)             0.25% 2.00%        
Duration of interest rate cash flow hedge     3 years                  
Amount of interest rate hedge                 63,400,000 101,000,000    
Effective interest rate on the hedged term debt                     0.56% plus our base margin 1.615% plus our base margin
Interest rate range, minimum (in hundredths)     2.19%                  
Interest rate range, maximum (in hundredths)     3.62%                  
Effective interest rate (in hundredths) 3.03%   3.03%                  
Interest expense, net $ 987,000 $ 1,200,000 $ 2,000,000 $ 2,500,000