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Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee severance accruals |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 0 | $ 1,517 | $ 280
Charged to costs and expenses | 1,649 | 571 | 3,641
Deduction | 508 | 2,088 | 2,404
Balance at end of year | 1,141 | 0 | 1,517
Valuation allowance of the deferred tax asset |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 244 | 209 | 189
Charged to costs and expenses | 32 | 35 | 20
Deduction | 0 | 0 | 0
Balance at end of year | 276 | 244 | 209
SEC Schedule, 12-09, Valuation Allowance, Current [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 835 | 746 | 729
Charged to costs and expenses | 1,111 | 1,248 | 1,155
Deduction | 1,177 | 1,159 | 1,138
Balance at end of year | 769 | 835 | 746
SEC Schedule, 12-09, Valuation Allowance, Noncurrent [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 2,278 | 2,166 | 2,042
Charged to costs and expenses | 730 | 950 | 943
Deduction | 857 | 838 | 819
Balance at end of year | $ 2,151 | $ 2,278 | $ 2,166

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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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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + 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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- Definition Amount of decrease in 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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