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Long-Term Debt (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Apr. 30, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 24, 2018
USD ($)
Mar. 25, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 24, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 14, 2018
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2013
Debt Instrument [Line Items]                      
Loss on early debt extinguishment     $ 0 $ 0 $ (1,100,000) $ 0 $ 1,073,000 $ 23,100,000      
Senior Secured Term Loan [Member]                      
Debt Instrument [Line Items]                      
Periodic principal payment   $ 7,500,000                  
2017 Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   1,025,000,000                  
Total indebtedness to consolidated cash flow ratio requirement           5.50          
2017 Credit Agreement [Member] | Canadian Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   $ 15,000,000                  
2017 Credit Agreement [Member] | Canadian Revolving Credit Facility CAD and USD [Member]                      
Debt Instrument [Line Items]                      
Interest rate margin over LIBOR   2.00%                  
2017 Credit Agreement [Member] | Senior Secured Term Loan [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   $ 750,000,000                  
Original issue discount                 $ 900,000    
2017 Credit Agreement [Member] | Senior Secured Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   $ 275,000,000                  
Line of credit outstanding $ 0   $ 0     $ 0          
Commitment fee percentage   0.375%                  
Notes Payable due 2024 [Member]                      
Debt Instrument [Line Items]                      
Total indebtedness to consolidated cash flow ratio requirement           5.00          
Notes Payable due 2024 [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Restricted payment           $ 60,000,000          
Notes Payable due 2024 [Member] | Senior Unsecured Notes [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount                   $ 450,000,000  
Interest rate, stated percentage                   5.375%  
2027 Senior Notes at 5.375% [Member]                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 5.375%   5.375%     5.375%          
2027 Senior Notes at 5.375% [Member] | Senior Unsecured Notes [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   $ 500,000,000                  
Interest rate, stated percentage   5.375%                  
Redemption price, percentage   35.00%                  
Early call date, premium price, percentage   105.375%                  
Redemption percentage of original face amount   100.00%                  
Notes Payable Due 2021 [Member] | Senior Unsecured Notes [Member]                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage                     5.25%
2013 Credit Agreement [Member] | Canadian Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt issuance costs   $ 7,700,000                  
Amortization of debt issuance costs   $ 15,500,000                  
2029 Notes at 5.250% [Member]                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage 5.25%   5.25%     5.25%          
2029 Notes at 5.250% [Member] | Senior Unsecured Notes [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount $ 500,000,000   $ 500,000,000     $ 500,000,000          
Interest rate, stated percentage 5.25%   5.25%     5.25%          
Redemption price, percentage 35.00%                    
Early call date, premium price, percentage 105.25%                    
Redemption percentage of original face amount 100.00%                    
London Interbank Offered Rate (LIBOR) [Member] | 2017 Credit Agreement [Member] | Senior Secured Term Loan [Member]                      
Debt Instrument [Line Items]                      
Effective interest rate percentage                 1.75%