Condensed Consolidated Statements of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Net income	$ 88,243	$ 73,778	$ 276,389	$ 196,650
Stockholders' Equity Attributable to Parent	1,337,555	1,123,003	1,337,555	1,123,003	$ 1,284,638	$ 1,183,998	$ 1,086,905	$ 980,943
Issuance of Company’s common stock for compensation			960	692
Retained Earnings
Net income	88,243	73,778	276,389	196,650
Stockholders' Equity Attributable to Parent	$ 1,150,115	$ 885,472	$ 1,150,115	$ 885,472	$ 1,072,959	$ 906,841	$ 822,497	$ 720,441
Common Stock
Common Stock, Shares, Issued	42,598,000	43,217,000	42,598,000	43,217,000	42,906,000	43,217,000	43,437,000	43,326,000
Stockholders' Equity Attributable to Parent	$ 433	$ 435	$ 433	$ 435	$ 433	$ 432	$ 435	$ 433
Issuance of Company’s common stock for compensation			0	1
Additional Paid-in Capital
Stockholders' Equity Attributable to Parent	296,956	291,733	296,956	291,733	293,720	294,330	289,261	284,007
Issuance of Company’s common stock for compensation			960	691
Accumulated Other Comprehensive Income (Loss)
Stockholders' Equity Attributable to Parent	(35,387)	(17,002)	(35,387)	(17,002)	(36,193)	(17,605)	(11,778)	(10,428)
Treasury Stock [Member]
Stockholders' Equity Attributable to Parent	$ (74,562)	$ (37,635)	$ (74,562)	$ (37,635)	$ (46,281)	$ 0	$ (13,510)	$ (13,510)