Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2018		48,809		(2,166)
Beginning balance at Dec. 31, 2018	$ 638,990	$ 488	$ 452,730	$ (100,438)	$ 286,059	$ 151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock into treasury (in shares)				378
Repurchase of common stock into treasury	(17,930)			$ (17,930)
Equity awards vested and exercised, net of shares withheld for payroll taxes (in shares)		313
Equity awards vested and exercised, net of shares withheld for payroll taxes	(10,281)	$ 3	(10,284)
Share-based compensation	5,186		5,186
Comprehensive income (loss)	34,021				34,122	(101)
Ending balance (in shares) at Mar. 31, 2019		49,122		(2,544)
Ending balance at Mar. 31, 2019	649,986	$ 491	447,632	$ (118,368)	320,181	50
Beginning balance (in shares) at Dec. 31, 2019		49,283		(2,561)
Beginning balance at Dec. 31, 2019	736,742	$ 493	455,193	$ (119,143)	400,047	152
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards vested and exercised, net of shares withheld for payroll taxes (in shares)		140
Equity awards vested and exercised, net of shares withheld for payroll taxes	(4,353)	$ 1	(4,354)
Share-based compensation	4,927		4,927
Comprehensive income (loss)	12,918				12,965	(47)
Ending balance (in shares) at Mar. 31, 2020		49,423		(2,561)
Ending balance at Mar. 31, 2020	$ 749,080	$ 494	$ 455,766	$ (119,143)	$ 411,858	$ 105