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Derivative Instruments (Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments	$ (127)	$ (2,440)	$ (7,906)
Others [Member]
Derivative [Line Items]
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments	(127)	(244)	(685)
General and Administrative Expense [Member] | Total Equity Return Swap [Member]
Derivative [Line Items]
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments	0	(1,743)	(6,861)
Loss excluded from Adjusted EBITDA		1,252
Net Interest Expense [Member] | Total Equity Return Swap [Member]
Derivative [Line Items]
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments	$ 0	$ (453)	$ (360)

X

- Definition

Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Excluded from Adjusted EBITDA

+ References

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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