Stock-Based Compensation - Summary of Non-vested Restricted Stock Activity (Details) - Restricted stock awards	6 Months Ended
	Jun. 30, 2015 $ / shares shares
Number of SAR's Outstanding and Exercisable
Non-vested shares, Beginning balance (in shares) | shares	209,921
Granted (in shares) | shares	127,375
Vested (in shares) | shares	(134,983)
Forfeited (in shares) | shares	(12,239)
Non-vested shares, Ending balance (in shares) | shares	190,074
Weighted Average Exercise Price
Nonvested shares, Weighted Average Grant Date Fair Value, Beginning Balance (in usd per share) | $ / shares	$ 13.59
Non vested shares granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	14.98
Vested in period, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	18.42
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	17.59
Non-vested shares, Weighted Average Grant Date Fair Value, Ending Balance (in usd per share) | $ / shares	$ 10.83