CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY Statement - USD ($) $ in Thousands	Total	Restricted Stock Units	Common Stock	Common Stock Restricted Stock Units	Additional Paid-in Capital	Additional Paid-in Capital Restricted Stock Units	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance, beginning of period (in shares) at Dec. 31, 2018			54,080,192
Balance, beginning of period at Dec. 31, 2018	$ 1,262,596		$ 54		$ 544,700		$ 759,533		$ (41,514)
Treasury stock, beginning of period (in shares) at Dec. 31, 2018								19,735
Treasury stock, beginning period at Dec. 31, 2018								$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Stock units vested (in shares)				242,414
Stock units withheld for employee taxes		$ (13,483)				$ (13,483)
Stock units withheld for employee taxes (in shares)				(81,562)
Proceeds from stock options exercises	11,890				11,890
Proceeds from stock options exercises (in shares)			323,464
Stock-based compensation expense	10,425				10,425
Foreign currency translation adjustments, net of tax	2,943								2,943
Change in unrealized gains and losses on cash flow hedges, net of tax	3,100								3,100
Net income	60,754						60,754
Balance, end of period (in shares) at Mar. 31, 2019			54,564,508
Balance, end of period at Mar. 31, 2019	$ 1,338,225		$ 54		553,532		820,287		(35,471)
Treasury stock, end of period (in shares) at Mar. 31, 2019								19,735
Treasury stock, end of period at Mar. 31, 2019								$ (177)
Balance, beginning of period (in shares) at Dec. 31, 2019	55,187,711		55,187,711
Balance, beginning of period at Dec. 31, 2019	$ 1,596,145		$ 55		607,051		1,020,590		(31,374)
Treasury stock, beginning of period (in shares) at Dec. 31, 2019								19,735
Treasury stock, beginning period at Dec. 31, 2019								$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Stock units vested (in shares)				273,904
Stock units withheld for employee taxes		$ (15,822)				$ (15,822)
Stock units withheld for employee taxes (in shares)				(89,990)
Proceeds from stock options exercises	7,141		$ 1		7,140
Proceeds from stock options exercises (in shares)			217,475
Stock-based compensation expense	12,210				12,210
Foreign currency translation adjustments, net of tax	(28,519)								(28,519)
Change in unrealized gains and losses on cash flow hedges, net of tax	(9,368)								(9,368)
Cumulative effect of adoption of ASU | ASU 2016-13	130						130
Net income	$ 85,565						85,565
Balance, end of period (in shares) at Mar. 31, 2020	55,589,100		55,589,100
Balance, end of period at Mar. 31, 2020	$ 1,647,482		$ 56		$ 610,579		$ 1,106,285		$ (69,261)
Treasury stock, end of period (in shares) at Mar. 31, 2020								19,735
Treasury stock, end of period at Mar. 31, 2020								$ (177)