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Debt - Components of Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Components of beginning debt balance [Abstract]          
Long term debt, current portion, net of deferred issuance cost at beginning of period $ 17,708   $ 17,708   $ 15,208
Long-term debt, net 181,062   181,062   194,917
Debt Borrowing, Repayment, Amortization during period [Abstract]          
Repayment of debt and revolving credit facility     (12,500) $ (70,500)  
Amortization of deferred issuance cost 600 $ 400 1,145 $ 795  
Components of ending debt balance [Abstract]          
Long-term debt, current portion, net 17,708   17,708   15,208
Long term debt, net of deferred issuance cost at end of period 181,062   181,062   194,917
Wells Fargo Bank, National Association          
Components of beginning debt balance [Abstract]          
Debt under credit facilities at beginning of period     217,000    
Deferred issuance cost, net at beginning of period     (6,875)    
Total Debt, net of deferred issuance cost at beginning of period     210,125    
Long term debt, current portion, net of deferred issuance cost at beginning of period 17,708   17,708   15,208
Long-term debt, net 181,062   181,062   194,917
Debt Borrowing, Repayment, Amortization during period [Abstract]          
Proceeds from lines of credit     0    
Deferred issuance cost, gross     0    
Increase in borrowings net of deferred issuance cost     0    
Repayment of debt and revolving credit facility     (12,500)    
Amortization of deferred issuance cost     1,145    
Decrease in repayment/amortization net of deferred issuance cost     (11,355)    
Components of ending debt balance [Abstract]          
Debt under credit facilities at end of period 204,500   204,500    
Deferred issuance cost, net at end of period (5,730)   (5,730)    
Total Debt, net of deferred issuance cost at end of period 198,770   198,770    
Long-term debt, current portion, net 17,708   17,708   15,208
Long term debt, net of deferred issuance cost at end of period 181,062   181,062   $ 194,917
Wells Fargo Bank, National Association | Term Loan Facility          
Components of beginning debt balance [Abstract]          
Debt under credit facilities at beginning of period     182,500    
Debt Borrowing, Repayment, Amortization during period [Abstract]          
Proceeds from lines of credit     0    
Repayment of debt and revolving credit facility     (7,500)    
Components of ending debt balance [Abstract]          
Debt under credit facilities at end of period 175,000   175,000    
Wells Fargo Bank, National Association | Revolving Credit Facility          
Components of beginning debt balance [Abstract]          
Debt under credit facilities at beginning of period     34,500    
Debt Borrowing, Repayment, Amortization during period [Abstract]          
Proceeds from lines of credit     0    
Repayment of debt and revolving credit facility     (5,000)    
Components of ending debt balance [Abstract]          
Debt under credit facilities at end of period $ 29,500   $ 29,500