Partners' Equity Equity 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]
Non-cash equity based compensation expense	$ 13,434	$ 11,878	$ 10,998
Allocated Share-based Compensation Expense	14,568	16,959	17,955
Compensation Plans Settable in Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock or Unit Option Plan Expense	0	5	580
Phantom Share Units (PSUs) [Member] \| Compensation Plans Settable in Cash or Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity based compensation expense	0	0	788
Performance Units [Member] \| Compensation Plans Settable in Cash or Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity based compensation expense	507	4,586	8,041
Performance Units [Member] \| Compensation Plans Settable in Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	8,822	7,519	3,677
Deferred Units [Member] \| Compensation Plans Settable in Cash or Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	627	993	794
Restricted Stock Units (RSUs) [Member] \| Compensation Plans Settable in Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity based compensation expense	$ 4,612	$ 3,856	$ 4,075

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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