Income Taxes - Current and Deferred (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Deferred tax assets:
Compensation and benefits	$ 7,940		$ 9,715
Net operating loss and capital loss carryover	30,139		19,755
Share-based compensation	5,851		6,824
Research and development credits	6,843		7,550
Foreign tax credits	14,643		12,660
Tax benefits on uncertain tax positions	1,315		1,351
Goodwill and definite-lived intangibles	8,622		10,347
Depreciation	1,108		1,167
Other	5,998		5,259
Total deferred tax assets	82,459		74,628
Less: valuation allowance	(69,419)		(20,979)
Total deferred tax assets, net of valuation allowance	13,040		53,649
Deferred tax liabilities:
Capitalized software	(7,693)		(12,174)
Indefinite-lived intangibles	(2,448)		(2,332)
Other	(684)		(455)
Total deferred tax liabilities	(10,825)		(14,961)
Net deferred tax assets	2,215	$ 42,300	$ 38,688
Increase in valuation allowance	48,100
Non-U.S. jurisdictions
Deferred tax liabilities:
Net deferred tax assets	$ 4,700