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Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning Balance | $ 370,638
Ending Balance | 468,494
Unrealized Gains on Investments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning Balance | 421
Other comprehensive income before reclassifications | 188
Amounts reclassified from AOCI, net of tax | (45)
Net other comprehensive income | 143
Ending Balance | 564
Cumulative Foreign Currency Translation Adjustments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning Balance | (29,084)
Other comprehensive income before reclassifications | 18,820
Net other comprehensive income | 18,820
Ending Balance | (10,264)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning Balance | (10,728)
Amounts reclassified from AOCI, net of tax | 184
Net other comprehensive income | 184
Ending Balance | (10,544)
Accumulated Other Comprehensive Income (Loss) |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning Balance | (39,391)
Other comprehensive income before reclassifications | 19,008
Amounts reclassified from AOCI, net of tax | 139
Net other comprehensive income | 19,147
Ending Balance | $ (20,244)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 + Details
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