Incentive Compensation - Summary of Incentive Compensation Expense (Details) - General and administrative expenses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash—short and long-term incentive plans	$ 1,471	$ 1,568	$ 3,243	$ 3,202
Total incentive compensation expense	5,286	10,693	16,282	18,553
Restricted common and subordinated units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	2,591	3,371	5,610	6,776
Restricted Performance Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	637	5,173	6,257	7,415
Common Units | Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total incentive compensation expense	$ 587	$ 581	$ 1,172	$ 1,160