SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts
Changes in valuation and qualifying accounts
Balance at beginning of period	$ 2,124	$ 2,437	$ 2,339
Charged (credited) to costs and expenses	4,396	812	(56)
Credited to other accounts	(14)	(280)	154
(Deductions) Adjustments		(845)
Balance at end of period	6,506	2,124	2,437
Tax valuation allowance
Changes in valuation and qualifying accounts
Balance at beginning of period	206,630	236,332	329,523
Charged (credited) to costs and expenses	1,107	(1,679)	6,162
(Deductions) Adjustments	(13,949)	(28,023)	(99,353)
Balance at end of period	$ 193,788	$ 206,630	$ 236,332

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

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Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

+ References

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Amount of increase in valuation and qualifying accounts and reserves from charge to accounts other than cost and expense.

+ References

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Amount of decrease in valuation and qualifying accounts and reserves.

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