Stock Incentive Plans (Summary of Restricted Common Stock and Performance-Based Restricted Stock Unit Activity) (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Restricted Common Stock
Number of Shares
Unvested at the beginning of the period (in shares) | shares	374,817
Granted (in shares) | shares	685,872
Vested (in shares) | shares	(30,350)
Forfeited (in shares) | shares	(3,390)
Unvested at the end of the period (in shares) | shares	1,026,949
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share) | $ / shares	$ 12.68
Granted (in dollars per share) | $ / shares	15.06
Vested (in dollars per share) | $ / shares	(9.72)
Forfeited (in dollars per share) | $ / shares	(13.24)
Unvested at the end of the period (in dollars per share) | $ / shares	$ 14.36
Restricted Stock Units
Number of Shares
Unvested at the beginning of the period (in shares) | shares	751,500
Granted (in shares) | shares	0
Vested (in shares) | shares	0
Forfeited (in shares) | shares	(5,500)
Unvested at the end of the period (in shares) | shares	746,000
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share) | $ / shares	$ 12.41
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	(0.00)
Forfeited (in dollars per share) | $ / shares	(12.45)
Unvested at the end of the period (in dollars per share) | $ / shares	$ 12.41