Common and Subordinated Units (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Nov. 05, 2018
Class of Stock [Line Items]
Partners' capital account, distribution amount per share (in dollars per share)	$ 1.35
Stock repurchase program, authorized amount		$ 75,000,000.0
Series B Cumulative Convertible Preferred Units
Class of Stock [Line Items]
Preferred units minimum voting rights rate (percent)	15.00%
Preferred units distribution rate	7.00%
Common Units
Class of Stock [Line Items]
Treasury stock, value, acquired, cost method	$ 0
Common Units \| November 2018 Repurchase Program
Class of Stock [Line Items]
Treasury stock, value, acquired, cost method	$ 4,200,000

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.3-04)
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