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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		6 Months Ended
	Jun. 30, 2018 shares	Jun. 30, 2017 shares	Jun. 30, 2018 shares	Jun. 30, 2017 shares
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	26.10%		26.10%
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)	922		922
Fully converted partnership units and diluted weighted average shares outstanding (in shares)	30,000	29,400	29,900	29,400

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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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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

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