Condensed Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interest
Beginning balance at Dec. 31, 2020	$ 1,451,119	$ 110	$ 1,268,471	$ (77,218)	$ 1,264	$ 264,250	$ (5,758)
Beginning balance (in shares) at Dec. 31, 2020		104,775		5,407
Issuance of subsidiary shares to noncontrolling interest			(2)				2
Net income (loss)	2,653					4,169	(1,516)
Other comprehensive income (loss)	(965)				(965)
Cash dividends paid on common stock	(10,514)					(10,514)
Issuance of common stock in connection with exercise of stock options	760		760
Issuance of common stock in connection with exercise of stock options (in shares)		37
Issuance of common stock in connection with employee stock purchase plan	6,486	$ 1	6,485
Issuance of common stock in connection with employee stock purchase plan (in shares)		633
Issuance of restricted stock, net of shares canceled	1	$ 1
Issuance of restricted stock, net of shares canceled (in shares)		1,050
Repurchases of common stock, shares exchanged	(8,343)			$ (8,343)
Repurchases of common stock, shares exchanged (in shares)		(392)		392
Repurchases of common stock	(34,981)			$ (34,981)
Repurchases of common stock, (in shares)		(1,525)		1,525
Stock-based compensation expense	28,054		28,054
Ending balance at Jun. 30, 2021	1,434,270	$ 112	1,303,768	$ (120,542)	299	257,905	(7,272)
Ending balance (in shares) at Jun. 30, 2021		104,578		7,324
Beginning balance at Mar. 31, 2021	1,436,877	$ 112	1,288,400	$ (109,577)	185	264,273	(6,516)
Beginning balance (in shares) at Mar. 31, 2021		104,875		6,825
Issuance of subsidiary shares to noncontrolling interest			1				(1)
Net income (loss)	(1,873)					(1,118)	(755)
Other comprehensive income (loss)	114				114
Cash dividends paid on common stock	(5,250)					(5,250)
Issuance of common stock in connection with exercise of stock options	532		532
Issuance of common stock in connection with exercise of stock options (in shares)		26
Issuance of restricted stock, net of shares canceled (in shares)		176
Repurchases of common stock, shares exchanged	(991)			$ (991)
Repurchases of common stock, shares exchanged (in shares)		(45)		45
Repurchases of common stock	(9,974)			$ (9,974)
Repurchases of common stock, (in shares)		(454)		454
Stock-based compensation expense	14,835		14,835
Ending balance at Jun. 30, 2021	1,434,270	$ 112	1,303,768	$ (120,542)	299	257,905	(7,272)
Ending balance (in shares) at Jun. 30, 2021		104,578		7,324
Beginning balance at Dec. 31, 2021	1,340,428	$ 113	1,340,480	$ (178,022)	(752)	187,814	(9,205)
Beginning balance (in shares) at Dec. 31, 2021		103,260		10,200
Issuance of subsidiary shares to noncontrolling interest			(6)				6
Net income (loss)	17,503					19,319	(1,816)
Other comprehensive income (loss)	(2,896)				(2,896)
Cash dividends paid on common stock	(10,418)					(10,418)
Issuance of common stock in connection with exercise of stock options	63		63
Issuance of common stock in connection with exercise of stock options (in shares)		5
Issuance of common stock in connection with employee stock purchase plan	7,994	$ 1	7,993
Issuance of common stock in connection with employee stock purchase plan (in shares)		739
Issuance of restricted stock, net of shares canceled	2	$ 2
Issuance of restricted stock, net of shares canceled (in shares)		1,738
Repurchases of common stock, shares exchanged	(11,475)			$ (11,475)
Repurchases of common stock, shares exchanged (in shares)		(683)		683
Shares exchanged and returned to assumed plans				(178)
Repurchases of common stock	(17,260)			$ (17,260)
Repurchases of common stock, (in shares)		(1,029)		1,029
Stock-based compensation expense	32,284		32,284
Ending balance at Jun. 30, 2022	1,356,225	$ 116	1,380,814	$ (206,757)	(3,648)	196,715	(11,015)
Ending balance (in shares) at Jun. 30, 2022		104,030		11,734
Beginning balance at Mar. 31, 2022	1,354,647	$ 116	1,365,277	$ (206,350)	(1,766)	207,539	(10,169)
Beginning balance (in shares) at Mar. 31, 2022		103,921		11,726
Issuance of subsidiary shares to noncontrolling interest			(2)				2
Net income (loss)	(6,473)					(5,625)	(848)
Other comprehensive income (loss)	(1,882)				(1,882)
Cash dividends paid on common stock	(5,199)					(5,199)
Issuance of common stock in connection with exercise of stock options	58		58
Issuance of common stock in connection with exercise of stock options (in shares)		4
Issuance of restricted stock, net of shares canceled (in shares)		129
Repurchases of common stock, shares exchanged	(407)			$ (407)
Repurchases of common stock, shares exchanged (in shares)		(24)		24
Shares exchanged and returned to assumed plans				(16)
Stock-based compensation expense	15,481		15,481
Ending balance at Jun. 30, 2022	$ 1,356,225	$ 116	$ 1,380,814	$ (206,757)	$ (3,648)	$ 196,715	$ (11,015)
Ending balance (in shares) at Jun. 30, 2022		104,030		11,734