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Debt, Commitments and Contingencies - Debt (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Oct. 06, 2017
USD ($)
Debt Instrument [Line Items]            
Repayments of lines of credit     $ 3,000 $ 3,000    
Revolving Credit Facility | Line of Credit | 2017 Facility            
Debt Instrument [Line Items]            
Current borrowing capacity           $ 125,000
Long-term debt $ 64,000   64,000   $ 67,000 72,000
Maximum borrowing capacity           $ 175,000
Repayments of lines of credit $ 1,000 $ 1,000 $ 3,000 $ 3,000    
Effective interest rate (percent)     4.61% 4.05%    
Unused line commitment fee (percentage) 0.20%          
Consolidated leverage ratio covenant (not to exceed) 3.50   3.50      
Consolidated fixed charge coverage ratio covenant (at least) 1.25          
Revolving Credit Facility | Line of Credit | 2017 Facility | Federal Funds Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 0.50%          
Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 1.00%          
Scenario One, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio 1.00   1.00      
Scenario Two, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Minimum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio 1.00   1.00      
Scenario Two, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio 2.00   2.00      
Scenario Three, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Minimum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio 2.00   2.00      
Scenario Three, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio 3.00   3.00      
Scenario Four, Leverage Ratio | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio 3.00   3.00      
Less than 1.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 1.50%   1.50%      
Greater than or equal to 1.00 but less than 2.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 1.75%   1.75%      
Greater Than Or Equal To 2.00 But Less Than 3.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 2.00%   2.00%      
Greater Than Or Equal To 3.00 | Revolving Credit Facility | Line of Credit | 2017 Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 2.50%   2.50%