Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v2.4.0.8
Debt (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Sep. 30, 2013
Base Rate [Member]
Sep. 30, 2013
LIBOR [Member]
Sep. 30, 2013
Term loan [Member]
Jul. 31, 2011
Term loan [Member]
Sep. 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 65,600,000   65,600,000     92,200,000          
Term loan payments 2013 6,200,000   6,200,000                
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 39,300,000   39,300,000     48,000,000          
Letters of credit outstanding 573,000   573,000     1,300,000          
Debt outstanding 104,900,000   104,900,000     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                 57,200,000 101,000,000  
Effective interest rate on the hedged term debt                     1.615% plus our base margin
Interest rate range, minimum (in hundredths)     2.18%                
Interest rate range, maximum (in hundredths)     3.62%                
Effective interest rate (in hundredths) 3.08%   3.08%                
Interest expense, net $ 877,000 $ 1,400,000 $ 2,900,000 $ 3,900,000