Net Income Per Share - Calculation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 175,821	$ 168,239	$ 149,213	$ 110,598	$ 344,060	$ 259,811
Basic:
Weighted average shares (in shares)	108,833		110,861		109,025	111,141
Diluted:
Weighted average shares (in shares)	108,833		110,861		109,025	111,141
Dilutive effect of potential common shares (in shares)	863		1,028		1,118	1,050
Diluted weighted average shares (in shares)	109,696		111,889		110,143	112,191
Net income per share:
Basic (in usd per share)	$ 1.62		$ 1.35		$ 3.16	$ 2.34
Diluted (in usd per share)	$ 1.60		$ 1.33		$ 3.12	$ 2.32