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Debt - Components of Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 27 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
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 190,490   190,490 194,917
Debt Borrowing, Repayment, Amortization during period [Abstract]        
Repayment of debt and revolving credit facility (2,500) $ (40,000)    
Amortization of deferred issuance cost 573 $ 397    
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 190,490   190,490 194,917
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 190,490   190,490 194,917
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 (2,500)   (139,500)  
Amortization of deferred issuance cost 573      
Decrease in repayment/amortization net of deferred issuance cost (1,927)      
Components of ending debt balance [Abstract]        
Debt under credit facilities at end of period 214,500   214,500  
Deferred issuance cost, net at end of period (6,302)   (6,302)  
Total Debt, net of deferred issuance cost at end of period 208,198   208,198  
Long-term debt, current portion, net 17,708   17,708 15,208
Long term debt, net of deferred issuance cost at end of period 190,490   190,490 $ 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 (2,500)      
Components of ending debt balance [Abstract]        
Debt under credit facilities at end of period 180,000   180,000  
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 0      
Components of ending debt balance [Abstract]        
Debt under credit facilities at end of period $ 34,500   $ 34,500