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Fair Value Measurements and Derivative Instruments (Income Statement Hedging Instruments) (Details) - Fair value hedging - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ (132) | $ 3,823
Amount of Gain (Loss) Recognized in Income on Hedged Item | 6,065 | 12,275
Interest rate swaps | Interest expense, net of interest capitalized |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |
Amount of Gain (Loss) Recognized in Income on Derivative | 3,007 | 7,448
Amount of Gain (Loss) Recognized in Income on Hedged Item | 0 | 7,203
Interest rate swaps | Other income (expense) |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |
Amount of Gain (Loss) Recognized in Income on Derivative | (3,139) | (3,625)
Amount of Gain (Loss) Recognized in Income on Hedged Item | $ 6,065 | $ 5,072

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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