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Long-Term Debt (Credit Agreement) (Details) - Term loan - USD ($)
Jun. 04, 2018
Mar. 31, 2019
Mar. 18, 2019
Oct. 11, 2018
Debt Instrument [Line Items]        
Amortization of outstanding loan principal amount, quarterly installment 0.25%      
Credit Agreement        
Debt Instrument [Line Items]        
Long-term line of credit $ 1,300,000,000      
Basis spread on variable rate 1.00%      
Interest rate 7.00%      
Maximum borrowing capacity   $ 50,000,000.0    
Repurchased face amount     $ 25,400,000 $ 50,200,000
Repurchase amount     $ 25,000,000 $ 50,000,000
Par value discount rate     1.50% 0.40%
London Interbank Offered Rate | Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate 4.50%      
Alternative Base Rate | Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.50%      
Federal Funds Rate | Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.50%      
Minimum | London Interbank Offered Rate | Credit Agreement        
Debt Instrument [Line Items]        
Interest rate 1.00%      
Minimum | Alternative Base Rate | Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.00%