CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	[1],[2],[3],[4]	$ 10,617	$ 98,548	$ 45,015
Other comprehensive (loss) income, net of tax
Unrealized loss on available-for-sale marketable securities, net of tax	[1]	(17)	(63)	(19)
Foreign currency translation adjustments	[1]	(6,600)	9,559	(12,675)
Total other comprehensive (loss) income, net of tax	[1],[3]	(6,617)	9,496	(12,694)
Comprehensive income	[1]	$ 4,000	$ 108,044	$ 32,321

[1] On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

[2] On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

[3] On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

[4] On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.