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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)