Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended		12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Jan. 28, 2021	Feb. 27, 2020
Class of Stock [Line Items]
Preferred Stock, Shares Authorized		50,000			50,000				50,000			50,000
Preferred Stock, Shares Issued		0			0				0			0
Cash dividends declared per common share		$ 0.36	$ 0.36	$ 0.35	$ 0.35	$ 0.34	$ 0.34	$ 0.34	$ 1.07	$ 1.02		$ 1.37
Stock Repurchase Program, Authorized Amount													$ 30,000	$ 40,000
Purchase of treasury stock under share repurchase program									$ 0	$ 25,000
Treasury Stock | Shares Repurchase Program Authorized in January 2021
Class of Stock [Line Items]
Purchase of treasury stock under share repurchase program									$ 0
Subsequent Event [Member]
Class of Stock [Line Items]
Cash dividends declared per common share	$ 0.36										$ 1.43