Annual report pursuant to Section 13 and 15(d)

Debt (Details)

v2.4.0.8
Debt (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
LIBOR [Member]
Dec. 31, 2013
Base Rate [Member]
Dec. 31, 2013
Term loan [Member]
Jul. 31, 2011
Term loan [Member]
Dec. 31, 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 59,400,000 92,200,000            
Term loan payments 2014 25,000,000              
Term loan payments 2015 34,400,000              
Revolving loans maximum borrowing capacity 125,000,000              
Revolving loans potential increment in maximum borrowing capacity 175,000,000              
Revolving loans amount outstanding 30,300,000 48,000,000            
Letters of credit outstanding 573,000 1,300,000            
Debt outstanding 89,700,000 140,200,000            
Base margin (in hundredths)       2.00% 0.25%      
Duration of interest rate cash flow hedge 3 years              
Amount of interest rate hedge           51,000,000 101,000,000  
Effective interest rate on the hedged term debt               1.615% plus our base margin
Interest rate range, minimum (in hundredths) 2.16%              
Interest rate range, maximum (in hundredths) 3.62%              
Effective interest rate (in hundredths) 3.07%              
Interest expense, net $ 3,700,000 $ 5,200,000