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Income Taxes - Reconciliations Valuation Allowance on Deferred Tax Assets (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 778,262 | $ 815,689 | $ 1,167,927
(Deductions) additions to costs and expenses | 11,611 | 335 | 7,175
Additions: charges to other accounts | 0 | 0 | 0
Deductions | (248,232) | (37,762) | (359,413)
Balance at end of period | $ 541,641 | $ 778,262 | $ 815,689

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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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