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Long-term Debt - Senior Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 20, 2017
Debt Instrument [Line Items]          
Payments of Financing Costs $ 1,100        
Debt financing and related expenses   $ 0 $ 0 $ 6,640  
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 300,000      
Debt Instrument, Interest Rate, Stated Percentage   4.875%      
Debt Instrument, Maturity Date   Oct. 15, 2025      
Payments of Financing Costs 5,000        
Debt Issuance Costs, Noncurrent, Net         $ 4,900
Debt financing and related expenses 100        
Debt Instrument, Date of First Required Payment   Apr. 15, 2018      
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period One [Member]          
Debt Instrument [Line Items]          
Percentage of principal that can be redeemed with cash proceeds from an equity offering   35.00%      
Debt instrument redemption price with net proceeds from equity offering   104.875%      
Debt Instrument, Redemption Price, Percentage   100.00%      
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage   102.438%      
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Three [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage   101.219%      
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Four [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage   100.00%      
Senior Secured Term Loan A [Member]          
Debt Instrument [Line Items]          
Repayments of Debt 250,900        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 400        
Receivables Facility [Member]          
Debt Instrument [Line Items]          
Repayments of Debt $ 41,700