New Accounting Pronouncements New Accounting Pronouncements (Details) $ in Thousands	Dec. 31, 2015 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current deferred income tax assets	$ 0
Long-term deferred income tax assets	4,238
Long-term deferred income tax liabilities	(103,379)
Deferred Tax Liabilities, Net	(99,141)
Previous Accounting Guidance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current deferred income tax assets	14,150
Long-term deferred income tax assets	1,332
Long-term deferred income tax liabilities	(114,623)
Deferred Tax Liabilities, Net	(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)
Long-term deferred income tax assets	2,906
Long-term deferred income tax liabilities	11,244
Deferred Tax Liabilities, Net	$ 0