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Debt - Components of Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 167,135   167,135   194,917
Debt Borrowing, Repayment, Amortization during period [Abstract]          
Repayment of debt and revolving credit facility     (27,000) $ (100,000)  
Amortization of deferred issuance cost 600 $ 400 1,718 $ 1,192  
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 167,135   167,135   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 167,135   167,135   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     (27,000)    
Amortization of deferred issuance cost     1,718    
Decrease in repayment/amortization net of deferred issuance cost     (25,282)    
Components of ending debt balance [Abstract]          
Debt under credit facilities at end of period 190,000   190,000    
Deferred issuance cost, net at end of period (5,157)   (5,157)    
Total Debt, net of deferred issuance cost at end of period 184,843   184,843    
Long-term debt, current portion, net 17,708   17,708   15,208
Long term debt, net of deferred issuance cost at end of period 167,135   167,135   $ 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     (12,500)    
Components of ending debt balance [Abstract]          
Debt under credit facilities at end of period 170,000   170,000    
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     (14,500)    
Components of ending debt balance [Abstract]          
Debt under credit facilities at end of period $ 20,000   $ 20,000