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Stockholders' Equity - Changes in AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in the balances of each component of AOCI |  |  |
Balance at the beginning of the period | $ 840,093 | $ 601,704 | $ 714,615
Total other comprehensive income (loss), net of tax | 8 | 35 | 429
Balance at the end of the period | 437,775 | 840,093 | 601,704
Accumulated Other Comprehensive Income |  |  |
Changes in the balances of each component of AOCI |  |  |
Balance at the beginning of the period | 1,812 | 1,777 | 1,348
Other comprehensive income (loss) before reclassifications |  |  | (25)
Amounts reclassified from AOCI |  |  | 454
Total other comprehensive income (loss), net of tax | 8 | 35 | 429
Balance at the end of the period | 1,820 | 1,812 | 1,777
Foreign Currency Translation |  |  |
Changes in the balances of each component of AOCI |  |  |
Balance at the beginning of the period | 1,839 | 1,797 | 2,246
Other comprehensive income (loss) before reclassifications |  |  | (19)
Amounts reclassified from AOCI |  |  | (430)
Total other comprehensive income (loss), net of tax | (3) | 42 | (449)
Balance at the end of the period | 1,836 | 1,839 | 1,797
Minimum pension liability |  |  |
Changes in the balances of each component of AOCI |  |  |
Balance at the beginning of the period |  |  | (866)
Amounts reclassified from AOCI |  |  | 866
Total other comprehensive income (loss), net of tax |  |  | 866
Unrealized Gains (Losses) on Available for Sale Securities |  |  |
Changes in the balances of each component of AOCI |  |  |
Balance at the beginning of the period | (27) | (20) | (32)
Other comprehensive income (loss) before reclassifications |  |  | (6)
Amounts reclassified from AOCI |  |  | 18
Total other comprehensive income (loss), net of tax | 11 | (7) | 12
Balance at the end of the period | $ (16) | $ (27) | $ (20)

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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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