Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - Fair Value Hedging - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Derivative	$ (358)	$ 28,630
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,457	(19,775)
Interest rate swaps \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Derivative	1,173	2,362
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	3,925
Interest rate swaps \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Derivative	(1,531)	26,268
Amount of Gain (Loss) Recognized in Income on Hedged Item	$ 2,457	$ (23,700)

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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