Summary of Significant Accounting Policies Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]
Other Assets	$ 76,195	$ 75,659
Other current liabilities	31,596	32,200
Current portion of long-term obligations		61,938
Long-Term Obligations, Excluding Current Portion		1,784,210
Deferred Income Taxes	$ (127,239)	(106,938)
ASU 2015-03
New Accounting Pronouncement, Early Adoption [Line Items]
Other Assets		(18,414)
Current portion of long-term obligations		(1,577)
Long-Term Obligations, Excluding Current Portion		(16,837)
ASU 2015-17
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred Tax Assets, Net, Current		(81,744)
Other Assets		2,405
Other current liabilities		(4,615)
Deferred Income Taxes		(74,724)
Scenario, Previously Reported
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred Tax Assets, Net, Current		(81,744)
Other Assets		91,668
Other current liabilities		36,815
Current portion of long-term obligations		63,515
Long-Term Obligations, Excluding Current Portion		1,801,047
Deferred Income Taxes		$ (181,662)