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, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 4,655	$ 4,047	$ 3,104
Common shares issued (in shares)	111,136	110,506	92,145
Weighted average price per share purchased under employee stock purchase plans	$ 42.46	$ 37.98	$ 35.92
Weighted average per share grant date fair value (in dollars per share)	$ 10.71	$ 9.36	$ 9.24
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 4,700	$ 4,200	$ 3,300