Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Restricted Stock Units and Awards	Performance share units	Common Stock	Common Stock Restricted Stock Units and Awards	Common Stock Performance share units	Treasury Shares	Additional Paid-In Capital	Additional Paid-In Capital Restricted Stock Units and Awards	Additional Paid-In Capital Performance share units	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Common stock, beginning balance (in shares) at Dec. 31, 2021				135,187
Treasury stock, beginning balance (in shares) at Dec. 31, 2021							83,149
Beginning balance at Dec. 31, 2021	$ 704,548			$ 1,352			$ (694,716)	$ 770,117			$ 628,762	$ (967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	116,852										116,852
Other comprehensive income	4,584											4,584
Share repurchases (in shares)							1,628
Share repurchases	(67,976)						$ (67,976)
Indirect repurchase of shares for minimum tax withholding (in shares)							188
Indirect repurchase of shares for minimum tax withholding	(7,289)						$ (7,289)
Restricted stock units and awards and Performance share units (in shares)					120	211
Restricted stock units and awards and Performance share units		$ 0	$ 0		$ 1	$ 2			$ (1)	$ (2)
Stock options exercised (in shares)				541
Stock options exercised	7,994			$ 5				7,989
Stock-based compensation	11,987							11,987
Business acquisitions (in shares)				87
Business acquisitions	3,425			$ 1				3,424
Common stock, ending balance (in shares) at Sep. 30, 2022				136,146
Treasury stock, ending balance (in shares) at Sep. 30, 2022							84,965
Ending balance at Sep. 30, 2022	774,125			$ 1,361			$ (769,981)	793,514			745,614	3,617
Common stock, beginning balance (in shares) at Jun. 30, 2022				135,823
Treasury stock, beginning balance (in shares) at Jun. 30, 2022							84,221
Beginning balance at Jun. 30, 2022	764,523			$ 1,358			$ (737,559)	781,142			718,144	1,438
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,470										27,470
Other comprehensive income	2,179											2,179
Share repurchases (in shares)							744
Share repurchases	(32,422)						$ (32,422)
Restricted stock units and awards and Performance share units (in shares)					1
Stock options exercised (in shares)				254
Stock options exercised	4,098			$ 2				4,096
Stock-based compensation	5,559							5,559
Business acquisitions (in shares)				68
Business acquisitions	2,718			$ 1				2,717
Common stock, ending balance (in shares) at Sep. 30, 2022				136,146
Treasury stock, ending balance (in shares) at Sep. 30, 2022							84,965
Ending balance at Sep. 30, 2022	774,125			$ 1,361			$ (769,981)	793,514			745,614	3,617
Common stock, beginning balance (in shares) at Dec. 31, 2022				136,295
Treasury stock, beginning balance (in shares) at Dec. 31, 2022							86,115
Beginning balance at Dec. 31, 2022	713,452			$ 1,363			$ (824,778)	799,147			734,116	3,604
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	133,705										133,705
Other comprehensive income	811											811
Share repurchases (in shares)							1,151
Share repurchases	(58,000)						$ (58,000)
Indirect repurchase of shares for minimum tax withholding (in shares)							173
Indirect repurchase of shares for minimum tax withholding	$ (8,448)						$ (8,448)
Restricted stock units and awards and Performance share units (in shares)					153	244
Restricted stock units and awards and Performance share units		0	$ 0		$ 2	$ 2			(2)	$ (2)
Stock options exercised (in shares)	433			433
Stock options exercised	$ 8,375			$ 4				8,371
Stock-based compensation	9,721							9,721
Business acquisitions (in shares)				231
Business acquisitions	11,095			$ 3				11,092
Excise tax on share repurchases	(117)						$ (654)	537
Common stock, ending balance (in shares) at Sep. 30, 2023				137,356
Treasury stock, ending balance (in shares) at Sep. 30, 2023							87,439
Ending balance at Sep. 30, 2023	810,594			$ 1,374			$ (891,880)	828,864			867,821	4,415
Common stock, beginning balance (in shares) at Jun. 30, 2023				137,081
Treasury stock, beginning balance (in shares) at Jun. 30, 2023							87,259
Beginning balance at Jun. 30, 2023	776,043			$ 1,371			$ (882,088)	818,693			834,139	3,928
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,682										33,682
Other comprehensive income	487											487
Share repurchases (in shares)							176
Share repurchases	(9,472)						$ (9,472)
Indirect repurchase of shares for minimum tax withholding (in shares)							4
Indirect repurchase of shares for minimum tax withholding	(224)						$ (224)
Restricted stock units and awards and Performance share units (in shares)					9
Restricted stock units and awards and Performance share units		$ 0			$ 1				$ (1)
Stock options exercised (in shares)				212
Stock options exercised	4,123			$ 1				4,122
Stock-based compensation	3,102							3,102
Business acquisitions (in shares)				54
Business acquisitions	2,799			$ 1				2,798
Excise tax on share repurchases	54						$ (96)	150
Common stock, ending balance (in shares) at Sep. 30, 2023				137,356
Treasury stock, ending balance (in shares) at Sep. 30, 2023							87,439
Ending balance at Sep. 30, 2023	$ 810,594			$ 1,374			$ (891,880)	$ 828,864			$ 867,821	$ 4,415