Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Restricted Shares [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	1,270,233	[1]
Granted (in shares)	226,999
Vested (in shares)	(335,989)
Canceled/forfeited (in shares)	(10,800)
Non-vested restricted shares, ending balance (in shares)	1,150,443	[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	$ 31.80
Granted (in dollars per share) | $ / shares	47.03
Vested (in dollars per share) | $ / shares	14.10
Canceled/forfeited (in dollars per share) | $ / shares	33.87
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share) | $ / shares	$ 39.95
Restricted Stock Units [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	18,700
Non-vested restricted shares, ending balance (in shares)	2,400

[1] Includes 2,400 and 18,700 restricted stock units as of September 30, 2019 and December 31, 2018, respectively.