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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 |  |  |

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