Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Employee Stock Purchase Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 3,380	$ 3,086
Common shares issued (in shares)	87,014	79,459
Weighted average price per share purchased under employee stock purchase plans (in dollars per share)	$ 39.23	$ 39.36
Weighted average per share grant date fair value (in dollars per share)	$ 9.97	$ 9.62
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 3,400	$ 3,100