Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 20, 2021
Share Repurchases [Abstract]
Number of Shares Authorized to be Repurchased	6,700		6,700
Additional Shares Authorized to be Repurchased					3,000
Treasury Stock, Shares, Acquired	1,000	0	1,800	700
Treasury Stock Value, Acquired, Cost Method	$ 16,400		$ 30,900	$ 12,300
Dividends, Common Stock, Cash	41,100	$ 1,600	44,300	4,900
Special Dividend	39,500		39,500
Regular Dividend	$ 1,600	$ 1,600	$ 4,800	$ 4,900
Special Dividend Per Share	$ 0.5		$ 0.5