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Debt (Additional Information) (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 16, 2020
USD ($)
Oct. 02, 2020
USD ($)
Feb. 17, 2017
USD ($)
fiscal_quarter
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]                      
Borrowings under revolving credit facility       $ 60,000,000     $ 60,000,000 $ 60,000,000   $ 123,000,000  
Interest expense incurred on outstanding debt       $ 3,400,000   $ 1,800,000   $ 6,300,000 $ 6,100,000    
Revolving Credit Facility | Third Amended Credit Agreement                      
Debt Instrument [Line Items]                      
Debt instrument, term     5 years                
Maximum borrowing capacity     $ 450,000,000.0                
Additional borrowing capacity     $ 175,000,000.0                
Variable rate lower range, basis spread     0.375%                
Variable rate higher range, basis spread     0.75%                
Leverage ratio     3.25                
One-time leverage ratio maximum option     3.50                
One-time leverage ratio maximum option, number of fiscal quarters for period of increased maximum leverage ratio | fiscal_quarter     3                
ICR covenant limit     3.00                
Debt instrument, leverage ratio, maximum     2.75 2.75     2.75 2.75      
Borrowings       $ 0 $ 150,000,000.0   $ 0        
Discretionary principal payments on revolving credit facility       163,000,000.0       $ 213,000,000.0      
Borrowings under revolving credit facility       60,000,000.0     60,000,000.0 60,000,000.0      
Outstanding line of credit issuance costs       $ 700,000     $ 700,000 $ 700,000   $ 1,200,000  
Revolving Credit Facility | Third Amended Credit Agreement | Minimum                      
Debt Instrument [Line Items]                      
Unused capacity, commitment fee percentage     0.20%                
Revolving Credit Facility | Third Amended Credit Agreement | Maximum                      
Debt Instrument [Line Items]                      
Unused capacity, commitment fee percentage     0.30%                
Allowed restricted payments, including cash dividends     $ 20,000,000.0                
Revolving Credit Facility | Third Amended Credit Agreement | Eurocurrency loans                      
Debt Instrument [Line Items]                      
Line of credit, LIBOR rate, minimum basis spread     1.375%                
Line of credit, LIBOR rate, maximum basis spread     1.75%                
Revolving Credit Facility | Third Amended Credit Agreement | Interest rate swap contract                      
Debt Instrument [Line Items]                      
Hedged balance on debt instrument                     $ 75,000,000.0
Revolving Credit Facility | Third Amended Credit Agreement | Interest rate swap contract | Subsequent Event                      
Debt Instrument [Line Items]                      
Settlement of interest rate swap   $ 2,400,000                  
Revolving Credit Facility | Third Amended Credit Agreement | Federal Funds Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     0.50%                
Revolving Credit Facility | Third Amended Credit Agreement | London Interbank Offered Rate (LIBOR)                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     1.00%         1.375%      
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Subsequent Event                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity $ 450,000,000.0                    
Additional borrowing capacity $ 175,000,000.0                    
Variable rate lower range, basis spread 0.625%                    
Variable rate higher range, basis spread 1.00%                    
Leverage ratio 3.25                    
One-time leverage ratio maximum option 3.50                    
ICR covenant limit 3.00                    
One-time leverage ratio maximum option, period of increased maximum leverage ratio 1 year                    
Amount of unrestricted domestic cash and cash equivalents permitted to net against indebtedness in calculation of total net leverage ratio (up to) 50,000,000.0                    
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Subsequent Event | Minimum                      
Debt Instrument [Line Items]                      
Unused capacity, commitment fee percentage 0.25%                    
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Subsequent Event | Maximum                      
Debt Instrument [Line Items]                      
Unused capacity, commitment fee percentage 0.35%                    
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Subsequent Event | Eurocurrency loans                      
Debt Instrument [Line Items]                      
Line of credit, LIBOR rate, minimum basis spread 1.625%                    
Line of credit, LIBOR rate, maximum basis spread 2.00%                    
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Federal Funds Rate | Subsequent Event                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 0.50%                    
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR) | Subsequent Event                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 1.00%