Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	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		$ 0.34	$ 0.34	$ 0.34	$ 0.34	$ 0.34	$ 0.34	$ 0.30	$ 1.02	$ 0.98		$ 1.32
Stock Repurchase Program, Authorized Amount	$ 20,000										$ 20,000		$ 40,000
Purchase of treasury stock under share repurchase program									$ 25,000	$ 431
Subsequent Event [Member]
Class of Stock [Line Items]
Cash dividends declared per common share	$ 0.35										$ 1.37