Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Employee Stock Purchase Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 7,090	$ 4,655	$ 4,047
Common shares issued (in shares)	239,322	111,136	110,506
Weighted average price per share purchased under employee stock purchase plans	$ 29.61	$ 42.46	$ 37.98
Weighted average per share grant date fair value (in dollars per share)	$ 9.08	$ 10.71	$ 9.36
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 7,100	$ 4,700	$ 4,200