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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
	Mar. 31, 2017 shares	Mar. 31, 2016 shares
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.80%
Limited partnership units (in shares)	7,500
Limited partnership units, conversion ratio	1
Outstanding stock percent that should be acquired for rights to be exercised	39.90%
Limited partnership units convertible into shares of common stock, eligible for conversion (in shares)	685
Fully converted partnership units and diluted weighted average shares outstanding (in shares)	29,300	28,700

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

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- Definition

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

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Partners' Capital Account, Units, Converted and Weighted Average Shares Outstanding, Diluted

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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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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.

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

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