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Accumulated Other Comprehensive (Loss)/Income - Changes in AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in accumulated other comprehensive income (loss) |  |  |
Balance | $ 529,797 | $ 505,329 | $ 463,464
Total other comprehensive income (loss), net of tax | 18,977 | (4,836) | (19,060)
Balance | 463,587 | 529,797 | 505,329
Accumulated Other Comprehensive Income (Loss) |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |
Balance | (42,350) | (37,514) | (18,454)
Other comprehensive income (loss) | 20,377 | (4,898) | (20,457)
Tax effect | (1,400) | 62 | 1,397
Total other comprehensive income (loss), net of tax | 18,977 | (4,836) | (19,060)
Balance | (23,373) | (42,350) | (37,514)
Foreign Currency |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |
Balance | (37,311) | (33,197) | (15,492)
Other comprehensive income (loss) | 17,027 | (4,114) | (17,705)
Tax effect | 0 | 0 | 0
Total other comprehensive income (loss), net of tax | 17,027 | (4,114) | (17,705)
Balance | (20,284) | (37,311) | (33,197)
Unrealized (Loss) Income on Intra-Entity Foreign Currency Transactions |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |
Balance | (5,017) | (4,292) | (2,957)
Other comprehensive income (loss) | 3,322 | (789) | (2,722)
Tax effect | (1,390) | 64 | 1,387
Total other comprehensive income (loss), net of tax | 1,932 | (725) | (1,335)
Balance | (3,085) | (5,017) | (4,292)
Unrealized Holding Gains (Losses) on Available-for-Sale Securities |  |  |
Changes in accumulated other comprehensive income (loss) |  |  |
Balance | (22) | (25) | (5)
Other comprehensive income (loss) | 28 | 5 | (30)
Tax effect | (10) | (2) | 10
Total other comprehensive income (loss), net of tax | 18 | 3 | (20)
Balance | $ (4) | $ (22) | $ (25)

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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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- Definition Amount before tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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