Fair Value Measurements and Derivative Instruments (Income Statement Hedging Instruments) (Details) - Fair value hedging - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Derivative	$ 3,823	$ 22,055
Amount of Gain (Loss) Recognized in Income on Hedged Item	12,275	8,210
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	7,448	11,276
Amount of Gain (Loss) Recognized in Income on Hedged Item	7,203	15,743
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	(3,625)	10,779
Amount of Gain (Loss) Recognized in Income on Hedged Item	$ 5,072	$ (7,533)

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.

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

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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