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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Oct. 21, 2021
Equity, Class of Treasury Stock [Line Items]
Common stock surrendered as payment	$ 103,340	$ 159,347	$ 106,036	$ 29	$ 317	$ 102,031
Value of common shares remaining to be repurchased	$ 209,792						$ 209,792
Repurchases in Accordance with Stock Award Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares), total							43
Common stock surrendered as payment							$ 63,492
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount								$ 100,000

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