Stockholders' Equity and Equity Compensation - Summary of Stock Award Activity (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Stock Awards
Outstanding, beginning balance (in shares) | shares	1,501,021
Outstanding, ending balance (in shares) | shares	1,572,096
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 18.78
Outstanding, ending balance (in dollars per share) | $ / shares	$ 19.31
Restricted Stock
Stock Awards
Distributed (in shares) | shares	(164,675)
Forfeited (in shares) | shares	(1,084)
Weighted Average Award Date Fair Value
Distributed (in dollars per share) | $ / shares	$ 22.75
Forfeited (in dollars per share) | $ / shares	$ 23.01
Restricted Stock Units
Stock Awards
Awarded (in shares) | shares	235,655
Distributed (in shares) | shares	(64,111)
Forfeited (in shares) | shares	(32,266)
Weighted Average Award Date Fair Value
Awarded (in dollars per share) | $ / shares	$ 23.03
Distributed (in dollars per share) | $ / shares	22.15
Forfeited (in dollars per share) | $ / shares	$ 19.60
Performance Stock Units
Stock Awards
Awarded (in shares) | shares	213,436
Distributed (in shares) | shares	(49,672)
Forfeited (in shares) | shares	(66,208)
Weighted Average Award Date Fair Value
Awarded (in dollars per share) | $ / shares	$ 23.04
Distributed (in dollars per share) | $ / shares	21.95
Forfeited (in dollars per share) | $ / shares	$ 19.13