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Accounts Payable and Accrued Liabilities - Carrying Value of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Payables and Accruals [Abstract] |  |
Accounts payable | $ 376,277 | $ 258,203
Current deferred revenue | 90,639 | 80,503
Wages, severance and related taxes | 57,633 | 76,157
Accrued rebates | 38,025 | 33,071
Employee benefits | 25,406 | 24,395
Accrued interest | 22,019 | 27,202
Other (individual items less than 5% of total current liabilities) | 68,929 | 69,012
Accounts payable and accrued liabilities | $ 678,928 | $ 568,543

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