Basis of Presentation - Early Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items]
Cost of revenues, exclusive of depreciation	$ 295,809	$ 247,531
Selling, general and administrative expenses, exclusive of depreciation	274,998	280,309
Operating income	153,376	203,369
Other non-operating items	(4,009)	929
Total non-operating (expense) income	(60,894)	(57,851)
Previous Accounting Method \| Accounting Standards Update 2017-06
New Accounting Pronouncement, Early Adoption [Line Items]
Cost of revenues, exclusive of depreciation	296,509	248,256
Selling, general and administrative expenses, exclusive of depreciation	275,698	281,034
Operating income	151,976	201,919
Other non-operating items	(2,609)	2,379
Total non-operating (expense) income	(59,494)	(56,401)
Effect of Accounting Change \| Accounting Standards Update 2017-06
New Accounting Pronouncement, Early Adoption [Line Items]
Cost of revenues, exclusive of depreciation	(700)	(725)
Selling, general and administrative expenses, exclusive of depreciation	(700)	(725)
Operating income	1,400	1,450
Other non-operating items	(1,400)	(1,450)
Total non-operating (expense) income	$ (1,400)	$ (1,450)

Total costs related to goods produced and sold during the reporting period.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ 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 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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