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Debt and Credit Agreements - Schedule of Debt Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Components of beginning debt balance [Abstract]        
Long term debt, current portion, net of deferred issuance cost at beginning of period $ 8,410      
Long-term debt, current portion, net 245,731      
Debt Borrowing, Repayment, Amortization during period [Abstract]        
Amortization of debt financing fees 1,590 $ 1,590 $ 0  
Components of ending debt balance [Abstract]        
Long term debt, current portion, net of deferred issuance cost at beginning of period 15,208 8,410   $ 15,208
Long-term debt, current portion, net 194,917 245,731   194,917
Wells Fargo Bank, National Association        
Components of beginning debt balance [Abstract]        
Debt under credit facilities at beginning of period 260,500      
Deferred issuance cost, net at beginning of period (6,359)      
Total Debt, net of deferred issuance cost at beginning of period 254,141      
Long term debt, current portion, net of deferred issuance cost at beginning of period 8,410      
Long-term debt, current portion, net 245,731      
Debt Borrowing, Repayment, Amortization during period [Abstract]        
Proceeds from debt 59,000      
Debt issuance cost (2,106)      
Increase in borrowings net of deferred issuance cost 56,894      
Repayment of debt and revolving credit facility (102,500)     (137,000)
Amortization of debt financing fees 1,590      
Decrease in repayment/amortization net of deferred issuance cost (100,910)      
Components of ending debt balance [Abstract]        
Debt under credit facilities at ending of period 217,000 260,500   217,000
Deferred issuance cost, net at ending of period (6,875) (6,359)   (6,875)
Total Debt, net of deferred issuance cost at ending of period 210,125 254,141   210,125
Long term debt, current portion, net of deferred issuance cost at beginning of period 15,208 8,410   15,208
Long-term debt, current portion, net 194,917 245,731   194,917
Term Loan Facility | Wells Fargo Bank, National Association        
Components of beginning debt balance [Abstract]        
Debt under credit facilities at beginning of period 192,500      
Debt Borrowing, Repayment, Amortization during period [Abstract]        
Proceeds from debt 0      
Repayment of debt and revolving credit facility (10,000)      
Components of ending debt balance [Abstract]        
Debt under credit facilities at ending of period 182,500 192,500   182,500
Revolving Credit Facility | Wells Fargo Bank, National Association        
Components of beginning debt balance [Abstract]        
Debt under credit facilities at beginning of period 68,000      
Debt Borrowing, Repayment, Amortization during period [Abstract]        
Proceeds from debt 59,000      
Repayment of debt and revolving credit facility (92,500)      
Components of ending debt balance [Abstract]        
Debt under credit facilities at ending of period $ 34,500 $ 68,000   $ 34,500