Valuation and Qualifying Accounts and Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 21,376	$ 24,370	$ 26,283
Additions Charged to Operations	17,568	9,165	5,813
Net Deductions and Other	(13,566)	(12,159)	(7,726)
Balance at End of Year	25,378	21,376	24,370
Allowance for Obsolescence
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	36,776	45,715	46,899
Additions Charged to Operations	127,592	31,455	33,305
Net Deductions and Other	(45,922)	(40,394)	(34,489)
Balance at End of Year	118,446	36,776	45,715
Income Tax Valuation Allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	74,125	77,334	133,297
Additions Charged to Operations	512,969	15,772	8,161
Net Deductions and Other	(7,849)	(18,981)	(64,124)
Balance at End of Year	$ 579,245	$ 74,125	$ 77,334

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

+ Details

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

+ References

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

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