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
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2011
Dec. 31, 2013
Debt Instrument [Line Items]            
Debt Instrument, Maturity Date     Jun. 30, 2016      
Financing costs         $ 1,700,000  
Amortization period of debt issuance costs         5Y  
Letters of credit outstanding           573,000
Debt outstanding 57,300,000   57,300,000     89,700,000
Interest rate range, minimum (in hundredths)     1.90%      
Interest rate range, maximum (in hundredths)     3.25%      
Effective interest rate (in hundredths) 2.05%   2.05%      
Interest expense, net 366,000 877,000 1,600,000 2,900,000    
LIBOR [Member]
            
Debt Instrument [Line Items]            
Base margin (in hundredths)     1.75%      
Base Rate [Member]
            
Debt Instrument [Line Items]            
Base margin (in hundredths)     0.00%      
Term loan [Member]
            
Debt Instrument [Line Items]            
Borrowings outstanding 31,300,000   31,300,000     59,400,000
Term loan payments 2014 6,300,000   6,300,000      
Term loan payments 2015 25,000,000   25,000,000      
Revolving Loans [Member]
            
Debt Instrument [Line Items]            
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 $ 26,000,000   $ 26,000,000     $ 30,300,000