Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details) - Common Stock [Member] - $ / shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Restricted Shares [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	[1]	1,448,591	1,970,586
Granted (in shares)		423,596	429,061
Vested (in shares)		(554,900)	(899,815)
Canceled/forfeited (in shares)		(47,054)	(51,241)
Non-vested restricted shares, ending balance (in shares)	[1]	1,270,233	1,448,591
Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, per share weighted average grant date fair value, beginning balance (in dollars per share)		$ 23.29	$ 21.61
Granted (in dollars per share)		41.41	40.46
Vested (in dollars per share)		17.73	28.08
Canceled/forfeited (in dollars per share)		22.26	18.22
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share)		$ 31.80	$ 23.29
Restricted Stock Units [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)		27,550	43,300
Non-vested restricted shares, ending balance (in shares)		18,700	27,550

[1] Includes 18,700, 27,550 and 43,300 restricted stock units as of December 31, 2018, 2017 and 2016, respectively.