Stockholders' Equity and Equity Compensation - Summary of Deferred Stock Unit Activity (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	1,275,707
Outstanding, ending balance (in shares) | shares	1,548,190
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 19.60
Outstanding, ending balance (in dollars per share) | $ / shares	$ 18.84
Deferred Stock Units
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	247,219
Awarded (in shares) | shares	43,782
Distributed (in shares) | shares	(18,272)
Outstanding, ending balance (in shares) | shares	272,729
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 19.92
Awarded (in dollars per share) | $ / shares	21.26
Distributed (in dollars per share) | $ / shares	22.33
Outstanding, ending balance (in dollars per share) | $ / shares	$ 19.91