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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 711,767 | $ 1,090,710 | $ 1,033,216
Additions: charges to bad debt expense | (23,814) | (19,530) | 44,116
Additions: charges to other accounts | 0 | 0 | 13,378
Deductions | (37,762) | (359,413) | 0
Balance at end of period | $ 650,191 | $ 711,767 | $ 1,090,710

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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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