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Long-Term Debt (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 25, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Mar. 14, 2018
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2013
USD ($)
Debt Instrument [Line Items]                
Loss on early debt extinguishment   $ 0 $ 1,073,000 $ 23,100,000        
Long-term debt, gross   $ 1,805,000,000 1,725,000,000   $ 1,685,000,000      
Senior Secured Term Loan [Member]                
Debt Instrument [Line Items]                
Periodic principal payment $ 7,500,000              
April 2017 Notes [Member]                
Debt Instrument [Line Items]                
Interest rate, stated percentage   5.375%            
Long-term debt, gross   $ 500,000,000 500,000,000   500,000,000      
April 2017 Notes [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]                
Debt Instrument [Line Items]                
Debt instrument, face amount               $ 885,000,000
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              
2013 Credit Agreement [Member] | Senior Secured Term Loan [Member]                
Debt Instrument [Line Items]                
Debt instrument, face amount               630,000,000
2013 Credit Agreement [Member] | Senior Secured Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Debt instrument, face amount               $ 255,000,000
2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt instrument, face amount 1,025,000,000              
Total indebtedness to consolidated cash flow ratio requirement   5.5            
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    
Long-term debt, gross   $ 735,000,000 735,000,000   735,000,000      
2017 Credit Agreement [Member] | Senior Secured Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 275,000,000              
Commitment fee percentage 0.375%              
Notes Payable due 2024 [Member]                
Debt Instrument [Line Items]                
Total indebtedness to consolidated cash flow ratio requirement   5            
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%  
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%    
Revolving Credit Facility [Member] | Revolving Credit Facility Due 2022 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross   $ 120,000,000 $ 40,000,000   $ 0