Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details) - Common Stock [Member]	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Restricted Shares [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	1,448,591	[1]
Granted (in shares)	116,822
Vested (in shares)	(36,477)
Canceled/forfeited (in shares)	(29,054)
Non-vested restricted shares, ending balance (in shares)	1,499,882	[1]
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) | $ / shares	$ 23.29
Granted (in dollars per share) | $ / shares	50.67
Vested (in dollars per share) | $ / shares	21.85
Canceled/forfeited (in dollars per share) | $ / shares	20.65
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share) | $ / shares	$ 25.51
Restricted Stock Units [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	27,550
Non-vested restricted shares, ending balance (in shares)	19,300

[1] Includes 19,300 and 27,550 restricted stock units as of June 30, 2018 and December 31, 2017, respectively.