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Derivative Instruments (Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments | $ 0 | $ (127) | $ (2,440)
Others [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments | 0 | (127) | (244)
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 | 0 | (1,743)
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 | $ 0 | $ (453)

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- Definition Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Excluded from Adjusted EBITDA + References No definition available. + Details
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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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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