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Long-Term Debt Credit Agreement (Details)
£ in Millions, CAD in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Mar. 24, 2017
CAD
Mar. 24, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                      
Current portion     $ 569,892,000   $ 569,892,000     $ 648,850,000     $ 217,127,000
Debt, Long-term and Short-term, Combined Amount     1,946,012,000   1,946,012,000     $ 3,112,076,000     $ 1,571,192,000
Letters Of Credit Fronting Fee       $ 500              
Letters Of Credit Fronting Fee Percentage       0.25%              
Debt Instrument, Contingent Maturity Date Threshold       90 days              
Loss on early extinguishment of debt as a result of entering into our Credit Agreement $ 4,375,000   $ 0 $ 7,052,000 $ 0            
Five and One Half Percent Senior Notes due 2022 [Member]                      
Debt Instrument [Line Items]                      
Senior note interest rate (percent)     5.50%   5.50% 5.50% 5.50% 5.50%     5.50%
Debt, Long-term and Short-term, Combined Amount     $ 300,000,000   $ 300,000,000     $ 300,000,000     $ 300,000,000
Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Debt, Long-term and Short-term, Combined Amount     $ 1,146,012,000   $ 1,146,012,000     $ 1,489,971,000     $ 771,192,000
Five Percent Senior Notes due 2020 [Member]                      
Debt Instrument [Line Items]                      
Senior note interest rate (percent)     5.00%   5.00% 5.00% 5.00% 5.00%     5.00%
Debt, Long-term and Short-term, Combined Amount     $ 500,000,000   $ 500,000,000     $ 280,000,000     $ 500,000,000
Term Loans And Revolving Loans Maintained as Eurodollar Rate Loans                      
Debt Instrument [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate       1.75%              
Term Loans and Revolving Loans Maintained as Bas Rate or Canadian Prime Rate Loans [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Basis Spread on Variable Rate       0.75%              
Term Loan [Member]                      
Debt Instrument [Line Items]                      
Loss on early extinguishment of debt as a result of entering into our Credit Agreement   $ 2,100,000                  
Term Loan [Member] | Debt Instrument, Redemption, December 31, 2018                      
Debt Instrument [Line Items]                      
Percentage of original principal amount due       5.00%              
Term Loan [Member] | Debt Instrument, Redemption, December 31, 2019                      
Debt Instrument [Line Items]                      
Percentage of original principal amount due       10.00%              
Term Loan [Member] | Debt Instrument, Redemption, December 31, 2020                      
Debt Instrument [Line Items]                      
Percentage of original principal amount due       10.00%              
Term Loan [Member] | Debt Instrument, Redemption, December 31, 2021                      
Debt Instrument [Line Items]                      
Percentage of original principal amount due       10.00%              
Term Loan [Member] | Debt Instrument, Redemption, December 31, 2022                      
Debt Instrument [Line Items]                      
Percentage of original principal amount due       10.00%              
Multicurrency Revolving Loan Facility                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity                   $ 1,190,000,000  
Multicurrency Incremental Loan Facility [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity               1,250,000,000      
Multicurrency Incremental Loan Facility [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Line of credit facility additional borrowing capacity               50,000,000      
U S Revolving Loans [Member] | Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Current portion               607,000,000      
Canadian Revolving Loans [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity | CAD                 CAD 15.0    
Canadian Term Loans [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity | CAD                 45.5    
Canadian Term Loans [Member] | Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Debt, Long-term and Short-term, Combined Amount     45,833,000   45,833,000   CAD 45.5 35,021,000 CAD 45.5   44,274,000
U S Term Loans [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity                   800,000,000  
U S Term Loans [Member] | Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Debt, Long-term and Short-term, Combined Amount     346,750,000   346,750,000     800,000,000   $ 800,000,000 310,250,000
Revolving And Term Loans [Member]                      
Debt Instrument [Line Items]                      
Loss on early extinguishment of debt as a result of entering into our Credit Agreement   $ 600,000                  
Revolving Loan [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.30%              
Revolving Loan [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.20%              
Revolving Loan [Member] | Maximum [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.35%              
Revolving Loan [Member] | Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Current portion               609,600,000      
Debt, Long-term and Short-term, Combined Amount     $ 416,501,000   $ 416,501,000     609,593,000     $ 99,500,000
British Pound Revolving Loans [Domain] | Bank Borrowings [Member]                      
Debt Instrument [Line Items]                      
Current portion | £           £ 2.0          
Revolving Loan - Letters of Credit [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity               $ 125,000,000