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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($)
3 Months Ended
Jan. 11, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 13, 2017
Jul. 06, 2016
Line of Credit Facility [Line Items]          
Outstanding borrowings   $ 384,500,000      
Collateralized debt facility $ 7,000,000.0 $ 7,000,000 $ 7,000,000    
Variable rate on loan   3.43%      
LIBOR          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 1.00%        
Credit Agreement          
Line of Credit Facility [Line Items]          
Outstanding borrowings   $ 377,500,000      
Remaining borrowing capacity on line of credit   $ 65,500,000      
Fixed interest rate percent     2.12%    
Debt subject to fixed interest rate     $ 175,000,000    
Credit Agreement | Variable Rate 1          
Line of Credit Facility [Line Items]          
Variable interest rate percent   4.00% 3.52%    
Debt subject to variable interest rate   $ 202,500,000 $ 213,500,000    
Credit Agreement | Interest Rate Swap 2          
Line of Credit Facility [Line Items]          
Fixed interest rate percent   2.62%      
Debt subject to fixed interest rate   $ 175,000,000      
Credit Agreement | Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Increase to revolving credit commitment       $ 100,000,000  
Maximum borrowing capacity       $ 375,000,000  
Interest rate increase if in event of default   2.00%      
Credit Agreement | Revolving Credit Facility | Minimum          
Line of Credit Facility [Line Items]          
Commitment fee percentage   0.15%      
Credit Agreement | Revolving Credit Facility | Maximum          
Line of Credit Facility [Line Items]          
Commitment fee percentage   0.40%      
Credit Agreement | Term Loan          
Line of Credit Facility [Line Items]          
Debt instrument, face amount         $ 150,000,000
Credit Agreement | Bridge Loan          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity         $ 25,000,000