Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v2.4.0.8
Debt (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2011
Dec. 31, 2013
Jul. 31, 2011
Debt Instrument [Line Items]          
Financing costs     $ 1,700,000    
Amortization period of debt issuance costs     5Y    
Debt outstanding 77,800,000     89,700,000  
Duration of interest rate cash flow hedge     3 years    
Amount of interest rate hedge 44,800,000       101,000,000
Interest rate range, minimum (in hundredths) 2.15%        
Interest rate range, maximum (in hundredths) 3.62%        
Effective interest rate (in hundredths) 3.14%        
Interest expense, net 692,000 1,100,000      
LIBOR [Member]
          
Debt Instrument [Line Items]          
Base margin (in hundredths) 2.00%        
Base Rate [Member]
          
Debt Instrument [Line Items]          
Base margin (in hundredths) 0.25%        
Term loan [Member]
          
Debt Instrument [Line Items]          
Borrowings outstanding 53,100,000     59,400,000  
Term loan payments 2014 18,700,000        
Term loan payments 2015 34,400,000        
Term loan [Member] | July 2012 to June 2014 [Member]
          
Debt Instrument [Line Items]          
Effective interest rate on the hedged term debt 1.615% plus our base margin        
Letters of Credit [Member]
          
Debt Instrument [Line Items]          
Letters of credit outstanding 573,000     573,000  
Revolving Loans [Member]
          
Debt Instrument [Line Items]          
Revolving loans maximum borrowing capacity 125,000,000        
Revolving loans potential increment in maximum borrowing capacity 175,000,000        
Revolving loans amount outstanding $ 24,700,000     $ 30,300,000