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Basis of Presentation - Early Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncement, Early Adoption [Line Items]
Decrease in operating expenses	$ (347,403)	$ (333,766)	$ (1,022,651)	$ (959,344)
Total non-operating (expense) income	(54,660)	(70,673)	(190,515)	(194,236)
Effect of Accounting Change | Accounting Standards Update 2017-06
New Accounting Pronouncement, Early Adoption [Line Items]
Decrease in operating expenses	1,700	1,800	4,900	5,800
Total non-operating (expense) income	$ (1,700)	$ (1,800)	$ (4,900)	$ (5,800)

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- Definition

Total costs of sales and operating expenses for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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