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Schedule II - Valuation and Qualifying Accoutns (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) | $ 4,413 | $ (47) | $ 8,126
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation Allowances and Reserves, Balance Period Start | 66,356 | 66,403 | 58,277
Deductions | 0 | 0 | 0
Valuation Allowances and Reserves, Balance Period End | 70,769 | 66,356 | 66,403
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | 11,527 | 11,174 | 3,785
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation Allowances and Reserves, Balance Period Start | 25,549 | 23,367 | 24,418
Deductions | (10,363) | (8,992) | (4,836)
Valuation Allowances and Reserves, Balance Period End | $ 26,713 | $ 25,549 | $ 23,367

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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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