Stock-Based Compensation (Details 2) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Restricted Stock Awards [Member]
Summary of restricted stock award and restricted stock units activity
Non-vested, Number of shares, Beginning balance	156
Number of shares, Granted	0
Number of shares, Vested	(156)
Number of shares, Cancelled or expired	0
Non-vested, Number of shares, Ending balance	0
Non-vested, Weighted average Grant Date Fair Value, Beginning balance	$ 11.19
Weighted Average Grant Date Fair Value, Granted	0.00
Weighted average Grant Date Fair Value, Vested	11.19
Weighted average Grant Date Fair Value, Cancelled or expired	0.00
Non-vested, Weighted average Grant Date Fair Value, Ending balance	$ 0.00
Market Share Unit [Member]
Summary of restricted stock award and restricted stock units activity
Non-vested, Number of shares, Beginning balance	150,871
Number of shares, Granted	166,434
Number of shares, Cancelled or expired	0
Non-vested, Number of shares, Ending balance	317,305
Non-vested, Weighted average Grant Date Fair Value, Beginning balance	$ 11.10
Weighted Average Grant Date Fair Value, Granted	13.82	$ 4.94
Non-vested, Weighted average Grant Date Fair Value, Ending balance	$ 12.53
Restricted Stock Units [Member]
Summary of restricted stock award and restricted stock units activity
Non-vested, Number of shares, Beginning balance	1,766,123
Number of shares, Granted	1,111,130
Number of shares, Vested	(493,697)
Number of shares, Cancelled or expired	(56,977)
Non-vested, Number of shares, Ending balance	2,326,579
Non-vested, Weighted average Grant Date Fair Value, Beginning balance	$ 7.18
Weighted Average Grant Date Fair Value, Granted	10.85
Weighted average Grant Date Fair Value, Vested	6.55
Weighted average Grant Date Fair Value, Cancelled or expired	9.03
Non-vested, Weighted average Grant Date Fair Value, Ending balance	$ 9.02