Stockholders' Equity and Equity Compensation - Summary of Deferred Stock Unit Activity (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Deferred Stock Units
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
Deferred Stock Units
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	253,445
Awarded (in shares) | shares	42,871
Distributed (in shares) | shares	(17,028)
Outstanding, ending balance (in shares) | shares	279,288
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 19.93
Awarded (in dollars per share) | $ / shares	23.59
Distributed (in dollars per share) | $ / shares	23.96
Outstanding, ending balance (in dollars per share) | $ / shares	$ 20.24