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Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership (Details) - Noncontrolling Interest shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 shares	Sep. 30, 2017 shares	Sep. 30, 2018 shares	Sep. 30, 2017 shares
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.90%		25.90%
Limited partnership units (in shares)	7,800		7,800
Limited partnership units, conversion ratio	1		1
Outstanding stock percent that should be acquired for rights to be exercised	39.90%		39.90%
Limited partnership units convertible into shares of common stock, eligible for conversion (in shares)	760		760
Fully converted partnership units and diluted weighted average shares outstanding (in shares)	30,300	29,500	30,000	29,400

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Limited Partners' Capital Account, Convertible Units, Conversion Ratio

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Limited Partners' Capital Account, Convertible Units, Eligible for Conversion

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Minimum Outstanding Stock Percentage That Should be Acquired for Rights Issued to Become Exercisable

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- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: 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

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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