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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Amounts Due to Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Noncontrolling Interest [Abstract]
Beginning balance	$ 9,278	$ 11,030	$ 11,030
Income attributable to noncontrolling interests	429	897	11,785
Distributions made	(1,501)	$ (3,295)	(13,419)
Other	43		(118)
Ending balance	$ 8,249		$ 9,278

X

- Definition

Carrying value as of the balance sheet date of accrued and other liabilities attributable to noncontrolling interest during the reporting period.

+ References

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- Definition

Other transactions related to noncontrolling interest.

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- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580

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-Topic 810
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

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-Publisher FASB
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- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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