Stock-Based Compensation - Summary of Restricted Stock Awards Activity (Details) - Restricted Stock and Restricted Stock Units Awards	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of Shares
Non vested, beginning balance (in shares) | shares	437,971
Shares granted (in shares) | shares	278,934
Vested shares (in shares) | shares	(184,670)
Shares forfeited (in shares) | shares	(31,450)
Non vested, ending balance (in shares) | shares	500,785
Weighted-Average Grant Price and Fair Value
Non vested, beginning balance (in dollars per share) | $ / shares	$ 21.54
Shares granted (in dollars per share) | $ / shares	23.36
Vested shares (in dollars per share) | $ / shares	25.88
Shares forfeited (in dollars per share) | $ / shares	21.07
Non vested, ending balance (in dollars per share) | $ / shares	$ 21.24