Derivative Financial Instruments - Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative liabilities, current	$ (11,724)	$ (16,533)
Derivative liabilities, noncurrent	(12,510)	(14,456)
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), net, total	(11,315)	(16,852)
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member] \| Prepaid Expenses Deferred Costs And Other Noncurrent Assets Caption [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, noncurrent	12,919	14,137
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member] \| Current Portion Of Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current	(11,724)	(16,533)
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, noncurrent	$ (12,510)	$ (14,456)

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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