Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Name:	us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Subsequent Events (Details) - USD ($)	Nov. 07, 2019	Aug. 17, 2017
Series B Participating Preferred Stock
Subsequent Events
Preference dividend (as a percent)		6.00%
Series B Participating Preferred Stock \| Subsequent event
Subsequent Events
Dividend declared (per share)	$ 0.375
Preference dividend (as a percent)	6.00%
Series B Participating Preferred Stock \| Subsequent event \| Maximum
Subsequent Events
Increase in stock repurchase plan	$ 51,863,817.13
Common Units \| Subsequent event
Subsequent Events
Dividend declared (per share)	$ 0.05
Series A Preferred Units \| Subsequent event
Subsequent Events
Dividend declared (per share)	$ 30.00