Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Employee Stock Purchase Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 3,936	$ 2,311
Common shares issued (in shares)	154,059	63,976
Weighted average price per share purchased under employee stock purchase plans	$ 25.61	$ 37.52
Weighted average per share grant date fair value (in dollars per share)	$ 7.71	$ 9.54
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 3,900	$ 2,400