Partners' Equity and Equity-Based Compensation Equity Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity-based compensation expense	$ 11,910	$ 11,243	$ 13,434
Share-based Payment Arrangement, Expense	12,521	10,977	14,568
Performance units | Awards Payable in Cash or Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity-based compensation expense	0	0	507
Performance units | Awards Payable in Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	5,535	5,413	8,822
Deferred units | Awards Payable in Cash or Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	611	(266)	627
Restricted units | Awards Payable in Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity-based compensation expense	$ 6,375	$ 5,830	$ 4,612