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Revolving Credit Facility and Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Sep. 03, 2018
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]      
Collateralized debt facility $ 7,000,000.0 $ 7,000,000 $ 6,959,000
Variable rate on loan   3.39%  
Outstanding borrowings   $ 395,500,000  
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   388,500,000  
Remaining borrowing capacity on line of credit   $ 58,300,000  
Fixed interest rate percent     2.68%
Debt subject to fixed interest rate     $ 175,000,000.0
Credit Agreement | Variable Rate 1      
Line of Credit Facility [Line Items]      
Variable interest rate percent   3.52% 2.82%
Debt subject to variable interest rate   $ 213,500,000 $ 97,000,000.0
Credit Agreement | Interest Rate Swap 2      
Line of Credit Facility [Line Items]      
Fixed interest rate percent   2.12%  
Debt subject to fixed interest rate   $ 175,000,000.0  
Revolving Credit Facility | Credit Agreement      
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%  
Revolving Credit Facility | Credit Agreement | Minimum      
Line of Credit Facility [Line Items]      
Commitment fee percentage   0.15%  
Revolving Credit Facility | Credit Agreement | Maximum      
Line of Credit Facility [Line Items]      
Commitment fee percentage   0.40%  
Term Loan | Credit Agreement      
Line of Credit Facility [Line Items]      
Debt instrument, face amount     150,000,000
Bridge Loan | Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 25,000,000