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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Period | $ 100,726 | $ 105,030 | $ 54,406
Charged (Credited) to Costs and Expenses | 14,499 | (49,490) | 50,715
Charged to Other Accounts |  | 45,301 |
Deductions |  | (115) | (91)
Balance at End of Period | 115,225 | 100,726 | 105,030
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Period | 270 | 286 | 206
Charged (Credited) to Costs and Expenses |  | 99 | 171
Deductions |  | (115) | (91)
Balance at End of Period | 270 | 270 | 286
Valuation allowance in net deferred tax assets |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Period | 100,456 | 104,744 | 54,200
Charged (Credited) to Costs and Expenses | 14,499 | (49,589) | 50,544
Charged to Other Accounts |  | 45,301 |
Balance at End of Period | $ 114,955 | $ 100,456 | $ 104,744

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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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