CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock		Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period (in shares) at Dec. 31, 2015	[1]			76,488
Balance, beginning of period at Dec. 31, 2015	[1]	$ 526,987		$ 765		$ 145,418	$ 384,311	$ (3,507)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from adoption of ASU 2016-09	[1]	321					321
Repurchase of common stock (in shares)	[1]			(1,078)
Repurchase of common stock	[1]	(27,028)		$ (11)		(27,017)
Issuance of common stock for share-based compensation plans (in shares)	[1]			1,161
Issuance of common stock for share-based compensation plans	[1]	(15,856)		$ 12		(15,868)
Issuance of common stock under Employee Stock Purchase Plan (in shares)	[1]			20
Issuance of common stock under Employee Stock Purchase Plan	[1]	562				562
Stock-based compensation	[1]	40,808				40,808
Cash dividends declared ($0.12 per share) in the period ended December 31, 2018, Cash dividends declared ($0.12 per share) in the period ended December 31, 2017, Cash dividends declared ($0.12 per share) in the period ended December 31, 2016	[1]	(9,175)					(9,175)
Other comprehensive loss	[1]	(12,694)	[2]					(12,694)
Net income	[1]	45,015	[2],[3],[4]				45,015
Balance, end of period (in shares) at Dec. 31, 2016	[1]			76,591
Balance, end of period at Dec. 31, 2016	[1]	548,940		$ 766		143,903	420,472	(16,201)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)	[1]			(99)
Repurchase of common stock	[1]	(4,493)		$ 0		(4,493)
Issuance of common stock for share-based compensation plans (in shares)	[1]			1,568
Issuance of common stock for share-based compensation plans	[1]	(41,627)		$ 15		(41,642)
Issuance of common stock under Employee Stock Purchase Plan (in shares)	[1]			21
Issuance of common stock under Employee Stock Purchase Plan	[1]	1,009				1,009
Stock-based compensation	[1]	53,320				53,320
Cash dividends declared ($0.12 per share) in the period ended December 31, 2018, Cash dividends declared ($0.12 per share) in the period ended December 31, 2017, Cash dividends declared ($0.12 per share) in the period ended December 31, 2016	[1]	(9,323)					(9,323)
Other comprehensive loss	[1]	9,496	[2]					9,496
Net income	[1]	$ 98,548	[2],[3],[4]				98,548
Balance, end of period (in shares) at Dec. 31, 2017		78,081	[5]	78,081	[1]
Balance, end of period at Dec. 31, 2017	[1]	$ 655,870	[5]	$ 781		152,097	509,697	(6,705)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)	[1]			(1,001)
Repurchase of common stock	[1]	(55,275)		$ (10)		(55,265)
Issuance of common stock for share-based compensation plans (in shares)	[1]			1,413
Issuance of common stock for share-based compensation plans	[1]	(39,361)		$ 14		(39,375)
Issuance of common stock under Employee Stock Purchase Plan (in shares)	[1]			33
Issuance of common stock under Employee Stock Purchase Plan	[1]	1,767				1,767
Stock-based compensation	[1]	63,981				63,981
Cash dividends declared ($0.12 per share) in the period ended December 31, 2018, Cash dividends declared ($0.12 per share) in the period ended December 31, 2017, Cash dividends declared ($0.12 per share) in the period ended December 31, 2016	[1]	(9,451)					(9,451)
Other comprehensive loss	[1]	(6,617)	[2]					(6,617)
Net income	[1]	$ 10,617	[2],[3],[4]				10,617
Balance, end of period (in shares) at Dec. 31, 2018		78,526	[5]	78,526	[1]
Balance, end of period at Dec. 31, 2018	[1]	$ 621,531	[5]	$ 785		$ 123,205	$ 510,863	$ (13,322)

[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.

[5] 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.