CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Adjustments due to adoption of new accounting standard	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings	Accumulated Earnings Adjustments due to adoption of new accounting standard	Noncontrolling Interest
Balance, beginning of period, shares at Dec. 31, 2020		32,713,000
Balance, beginning of period at Dec. 31, 2020	$ 422,395	$ 700	$ 470,557		$ (894,126)	$ (31,138)	$ 876,402
Net Income (Loss)	72,331						72,331
Unrealized gain on short-term investments, net of tax	(19)					(19)
Foreign currency translation adjustments	(7,196)					(7,196)
Total comprehensive income	65,116
Repurchase of common stock	(42,238)		(6,258)		(35,980)
Repurchase of common stock, shares		(863,000)
Issuance of common stock pursuant to employee stock purchase plan	2,610		2,610
Issuance of common stock pursuant to employee stock purchase plan, shares		64,000
Issuance of restricted common stock pursuant to stock-based compensation plans		$ 6	(6)
Issuance of restricted common stock pursuant to stock-based compensation plans, shares		661,000
Cancellation of restricted common stock issued pursuant to stock-based compensation plans	(1)	$ (1)
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares		(80,000)
Stock-based compensation expense	21,400		21,400
Dividends	(32,673)						(32,673)
Noncontrolling interest related to business combination	3,635								$ 3,635
Balance, ending of period, shares at Dec. 31, 2021		32,495,000
Balance, ending of period at Dec. 31, 2021	440,244	$ 705	488,303		(930,106)	(38,353)	916,060		3,635
Net Income (Loss)	44,060						44,060
Unrealized gain on short-term investments, net of tax	7					(7)
Foreign currency translation adjustments	(20,483)					(20,483)
Total comprehensive income	23,584
Repurchase of common stock	(96,604)	$ (1)	(8,675)		(87,928)
Repurchase of common stock, shares		(1,635,000)
Issuance of common stock pursuant to employee stock purchase plan	2,969		2,969
Issuance of common stock pursuant to employee stock purchase plan, shares		57,000
Issuance of restricted common stock pursuant to stock-based compensation plans		$ 6	(6)
Issuance of restricted common stock pursuant to stock-based compensation plans, shares		544,000
Cancellation of restricted common stock issued pursuant to stock-based compensation plans		$ (2)	2
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares		(192,000)
Stock-based compensation expense	27,243		27,243
Settlement of convertible debt securities, net of tax	(4,845)		(4,845)
Dividends	(33,707)						(33,707)
Write-off of noncontrolling interest	$ (3,635)								$ (3,635)
Balance, ending of period, shares at Dec. 31, 2022	31,269,000	31,269,000
Balance, ending of period at Dec. 31, 2022	$ 355,249	$ 708	495,189	$ (9,802)	(1,018,034)	(58,829)	936,215	$ 9,802
Net Income (Loss)	66,246						66,246
Unrealized gain on short-term investments, net of tax	0
Foreign currency translation adjustments	8,416					8,416
Total comprehensive income	74,662
Repurchase of common stock	(128,179)	$ (2)	(10,156)		(118,021)
Repurchase of common stock, shares		(2,369,000)
Issuance of common stock pursuant to employee stock purchase plan	3,284		3,284
Issuance of common stock pursuant to employee stock purchase plan, shares		74,000
Issuance of restricted common stock pursuant to stock-based compensation plans		$ 7	(7)
Issuance of restricted common stock pursuant to stock-based compensation plans, shares		666,000
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares		(99,000)
Stock-based compensation expense	28,990		28,990
Purchase of capped call transactions, net of tax	(26,353)		(26,353)
Dividends	$ (34,327)						(34,327)
Balance, ending of period, shares at Dec. 31, 2023	29,541,000	29,541,000
Balance, ending of period at Dec. 31, 2023	$ 273,326	$ 713	$ 490,947		$ (1,136,055)	$ (50,413)	$ 968,134