Summary of Significant Accounting Policies - Cumulative Effect on the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
ASSETS
Deferred tax assets, net	$ 57,879	$ 35,154	$ 34,559
Liabilities:
Deferred revenue	5,414	7,498	8,618
Deferred revenue, non-current	9,581	14,995	16,115
Deferred tax liabilities, net	309,097	386,586	383,472
Shareholders’ equity:
Accumulated other comprehensive loss	(197,791)	(140,825)	(140,878)
Retained earnings	$ 841,050	917,624	917,956
Previously Reported
ASSETS
Deferred tax assets, net			34,559
Liabilities:
Deferred revenue			8,618
Deferred revenue, non-current			16,115
Deferred tax liabilities, net			383,472
Shareholders’ equity:
Accumulated other comprehensive loss			(140,878)
Retained earnings			$ 917,956
Transition Adjustments
ASSETS
Deferred tax assets, net		595
Liabilities:
Deferred revenue		(1,120)
Deferred revenue, non-current		(1,120)
Deferred tax liabilities, net		3,114
Shareholders’ equity:
Accumulated other comprehensive loss		53
Retained earnings		$ (332)