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New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Current deferred income tax assets |  | $ 0
Deferred Tax Assets, Net, Noncurrent | $ 3,712 | 4,238
Deferred Tax Liabilities, Net, Noncurrent | (119,143) | (103,379)
Net liability | $ (115,431) | (99,141)
Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Current deferred income tax assets |  | (14,150)
Deferred Tax Assets, Net, Noncurrent |  | 2,906
Deferred Tax Liabilities, Net, Noncurrent |  | 11,244
Net liability |  | 0
Previous Accounting Guidance [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Current deferred income tax assets |  | 14,150
Deferred Tax Assets, Net, Noncurrent |  | 1,332
Deferred Tax Liabilities, Net, Noncurrent |  | (114,623)
Net liability |  | $ (99,141)

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