Stockholders' Equity and Equity Compensation - Summary of Deferred Stock Unit Activity (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	1,143,205
Outstanding, ending balance (in shares) | shares	1,241,222
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 23.26
Outstanding, ending balance (in dollars per share) | $ / shares	$ 22.88
Deferred Stock Units
Deferred Stock Units
Outstanding, beginning balance (in shares) | shares	287,350
Awarded (in shares) | shares	2,891
Distributed (in shares) | shares	(9,438)
Outstanding, ending balance (in shares) | shares	280,803
Weighted Average Award Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 22.80
Awarded (in dollars per share) | $ / shares	16.69
Distributed (in dollars per share) | $ / shares	18.69
Outstanding, ending balance (in dollars per share) | $ / shares	$ 20.83