Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2020	45,267
Balance at Dec. 31, 2020	$ 657,701	$ 298,746	$ 10,140	$ 966,587
Net income	0	100,582	0	100,582
Other comprehensive income (loss)	0	0	2,161	2,161
Dividends and dividend equivalents declared	$ 0	(57,946)	0	(57,946)
Common stock issued under the employee equity incentive plan (in shares)	640
Common stock issued under the employee equity incentive plan	$ 12,920	0	0	12,920
Stock-based compensation expense	$ 60,758	0	0	60,758
Common stock issued under the employee stock purchase plan (in shares)	10
Common stock issued under the employee stock purchase plan	$ 2,293	0	0	2,293
Other comprehensive income (loss)	$ 0	0	2,161	2,161
Balance (in shares) at Jun. 30, 2021	45,917
Balance at Jun. 30, 2021	$ 733,672	341,382	12,301	1,087,355
Balance (in shares) at Mar. 31, 2021	45,737
Balance at Mar. 31, 2021	$ 699,359	315,206	7,012	1,021,577
Net income	0	55,169	0	55,169
Other comprehensive income (loss)	0	0	5,289	5,289
Dividends and dividend equivalents declared	$ 0	(28,993)	0	(28,993)
Common stock issued under the employee equity incentive plan (in shares)	180
Common stock issued under the employee equity incentive plan	$ 2,176	0	0	2,176
Stock-based compensation expense	32,137	0	0	32,137
Other comprehensive income (loss)	$ 0	0	5,289	5,289
Balance (in shares) at Jun. 30, 2021	45,917
Balance at Jun. 30, 2021	$ 733,672	341,382	12,301	$ 1,087,355
Balance (in shares) at Dec. 31, 2021	46,256			46,256
Balance at Dec. 31, 2021	$ 803,226	424,879	15,880	$ 1,243,985
Net income	0	194,245	0	194,245
Other comprehensive income (loss)	0	0	(30,566)	(30,566)
Dividends and dividend equivalents declared	$ 0	(73,204)	0	(73,204)
Common stock issued under the employee equity incentive plan (in shares)	524
Common stock issued under the employee equity incentive plan	$ 3,331	0	0	3,331
Stock-based compensation expense	$ 82,545	0	0	82,545
Common stock issued under the employee stock purchase plan (in shares)	7
Common stock issued under the employee stock purchase plan	$ 2,786	0	0	2,786
Other comprehensive income (loss)	$ 0	0	(30,566)	$ (30,566)
Balance (in shares) at Jun. 30, 2022	46,787			46,787
Balance at Jun. 30, 2022	$ 891,888	545,920	(14,686)	$ 1,423,122
Balance (in shares) at Mar. 31, 2022	46,625
Balance at Mar. 31, 2022	$ 847,966	467,844	10,302	1,326,112
Net income	0	114,679	0	114,679
Other comprehensive income (loss)	0	0	(24,988)	(24,988)
Dividends and dividend equivalents declared	$ 0	(36,603)	0	(36,603)
Common stock issued under the employee equity incentive plan (in shares)	162
Common stock issued under the employee equity incentive plan	$ 1,013	0	0	1,013
Stock-based compensation expense	42,909	0	0	42,909
Other comprehensive income (loss)	$ 0	0	(24,988)	$ (24,988)
Balance (in shares) at Jun. 30, 2022	46,787			46,787
Balance at Jun. 30, 2022	$ 891,888	$ 545,920	$ (14,686)	$ 1,423,122