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Debt, Commitments and Contingencies - Debt (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 06, 2017
USD ($)
Debt Instrument [Line Items]          
Repayments of credit facility   $ 4,000 $ 74,700 $ 0  
Line of Credit | 2017 Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Current borrowing capacity         $ 125,000
Long-term debt   67,000 71,000   72,000
Maximum borrowing capacity         $ 175,000
Repayments of credit facility   $ 4,000 $ 1,000    
Unused line commitment fee (percent) 0.20%        
Effective interest rate (percent)   4.13% 4.16% 5.81%  
Consolidated leverage ratio covenant (not to exceed)   3.50      
Consolidated fixed charge coverage ratio covenant (at least)   1.25      
Line of Credit | 2017 Facility | Revolving Credit Facility | Federal Funds rate          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   0.50%      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   1.00%      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario One, Leverage Ratio          
Debt Instrument [Line Items]          
Consolidated leverage ratio   1.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Two, Leverage Ratio | Minimum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   1.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Two, Leverage Ratio | Maximum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   2.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Three, Leverage Ratio | Minimum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   2.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Three, Leverage Ratio | Maximum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   3.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Four, Leverage Ratio | Maximum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   3.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Less Than 1.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   1.50%      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 1.00 But Less Than 2.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   1.75%      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 2.00 But Less Than 3.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   2.00%      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 3.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   2.50%