Stockholders' Equity and Equity Compensation - Summary of Deferred Stock Unit Activity (Details)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	1,275,707
Outstanding, ending balance (in shares) | shares	1,526,103
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 19.60
Outstanding, ending balance (in dollars per share) | $ / shares	$ 18.81
Deferred Stock Units
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	247,219
Awarded (in shares) | shares	44,824
Distributed (in shares) | shares	(39,660)
Outstanding, ending balance (in shares) | shares	252,383
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 19.92
Awarded (in dollars per share) | $ / shares	21.22
Distributed (in dollars per share) | $ / shares	21.29
Outstanding, ending balance (in dollars per share) | $ / shares	$ 19.93