Valuation and Qualifying Accounts and Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 25,378	$ 21,376	$ 24,370
Additions Charged to Operations	40,894	17,568	9,165
Net Deductions and Other	(44,314)	(13,566)	(12,159)
Balance at End of Year	21,958	25,378	21,376
Allowance for Obsolescence
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	118,446	36,776	45,715
Additions Charged to Operations	74,974	127,592	31,455
Net Deductions and Other	(146,220)	(45,922)	(40,394)
Balance at End of Year	47,200	118,446	36,776
Income Tax Valuation Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	579,245	74,125	77,334
Additions Charged to Operations	102,746	512,969	15,772
Net Deductions and Other	(318,271)	(7,849)	(18,981)
Balance at End of Year	$ 363,720	$ 579,245	$ 74,125

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

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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 valuation and qualifying accounts and reserves from charge to cost and expense.

+ References

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- Definition

Amount of decrease in valuation and qualifying accounts and reserves.

+ References

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