Stock-Based Compensation - Summary of Restricted Stock Awards Activity (Details) - Restricted Stock and Restricted Stock Units Awards	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Number of Shares
Non vested, beginning balance (in shares) | shares	437,971
Shares granted (in shares) | shares	278,137
Vested shares (in shares) | shares	(184,258)
Shares forfeited (in shares) | shares	(18,460)
Non vested, ending balance (in shares) | shares	513,390
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	21.38
Non vested, ending balance (in dollars per share) | $ / shares	$ 21.22