Distributions declared to non-controlling unitholders of RMCO, LLC.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Earnings Per Share and Dividends - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended		9 Months Ended
	Feb. 21, 2018	Nov. 01, 2017	Aug. 30, 2017	May 31, 2017	Mar. 22, 2017	Aug. 31, 2016	Jun. 02, 2016	Mar. 23, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Dividends Payable [Line Items]
Cash dividends declared per share of Class A common stock			$ 0.18	$ 0.18	$ 0.18	$ 0.15	$ 0.15	$ 0.15			$ 0.54	$ 0.45
Dividends declared and paid											$ 9,554
Common Class A
Dividends Payable [Line Items]
Cash dividends declared per share of Class A common stock									$ 0.18	$ 0.15	$ 0.54	$ 0.45
Dividends declared and paid			$ 3,185	$ 3,185	$ 3,184	$ 2,647	$ 2,647	$ 2,638			$ 9,554	$ 7,932
Quarterly dividend \| Common Class A
Dividends Payable [Line Items]
Cash dividends declared per share of Class A common stock	$ 0.20	$ 0.18
Non-controlling interest
Dividends Payable [Line Items]
Distributions declared to non-controlling unitholders			$ 2,261	$ 2,261	$ 2,261	$ 1,884	$ 1,884	$ 1,884			$ 6,783	$ 5,652