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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)