Incentive Compensation - Summary of Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 15,922	$ 11,278	$ 7,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	2,214	1,590	1,241
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	715	391	142
LTIP Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	6,572	5,617	4,507
2017 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 6,421	$ 3,680	$ 1,110