Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Accumulated other comprehensive loss	Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2020		272,154,504
Beginning balance at Dec. 31, 2020	$ 341,599	$ 2,722	$ 741,113	$ (26,233)	$ (376,003)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,006				57,006
Other comprehensive income (loss)	(9,161)			(9,161)
Purchase of capped call options, net of tax of $6,250	(19,430)		(19,430)
Dividends declared	(8,219)				(8,219)
Shares issued in connection with deferred compensation plan, net (in shares)		339,503
Shares issued in connection with deferred compensation plan, net	(8,859)	$ 3			(8,862)
Deferred compensation plan elective participant deferrals	854		854
Shares issued in connection with Executive Bonus Plan, net (in shares)		79,961
Shares issued in connection with Executive Bonus Plan, net	3,537	$ 1	5,573		(2,037)
Stock option exercises, net (in shares)		1,263,121
Stock option exercises, net	(5,407)	$ 12	1,739		(7,158)
Stock-based compensation expense	2,786		2,786
Shares related to restricted stock, net (in shares)		(114,606)
Shares related to restricted stock, net	(709)	$ (1)			(708)
Ending balance (in shares) at Mar. 31, 2021		273,722,483
Ending balance at Mar. 31, 2021	353,997	$ 2,737	732,635	(35,394)	(345,981)
Beginning balance (in shares) at Dec. 31, 2021		282,526,719
Beginning balance at Dec. 31, 2021	409,222	$ 2,825	937,805	(91,774)	(439,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,388				56,388
Other comprehensive income (loss)	16,450			16,450
Dividends declared	(8,353)				(8,353)
Shares issued in connection with deferred compensation plan, net (in shares)		809,751
Shares issued in connection with deferred compensation plan, net	(24,246)	$ 8			(24,254)
Deferred compensation plan elective participant deferrals	669		669
Shares issued in connection with Executive Bonus Plan, net (in shares)		72,105
Shares issued in connection with Executive Bonus Plan, net	2,804	$ 1	4,995		(2,192)
Shares issued in connection with employee stock purchase plan (in shares)		109,749
Shares issued in connection with employee stock purchase plan	4,490	$ 1	4,610		(121)
Stock option exercises, net (in shares)		1,401,249
Stock option exercises, net	(4,883)	$ 14	2,754		(7,651)
Acquisition option exercises, net (in shares)		149,855
Acquisition option exercises, net	0	$ 1	(1)
Stock-based compensation expense	6,667		6,667
Shares related to restricted stock, net (in shares)		64,665
Shares related to restricted stock, net	(1,555)	$ 1	(1)		(1,555)
Ending balance (in shares) at Mar. 31, 2022		285,134,093
Ending balance at Mar. 31, 2022	$ 457,653	$ 2,851	$ 957,498	$ (75,324)	$ (427,372)