Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Issuance of membership units, number of units | 161,000 | 97,000 | 793,000 |
| Redemption of shares of common stock, shares | 119,000 | 109,000 | 43,000 |
| Number of membership units exchanged | 37,000 | 0 | 0 |
| Common Stock | |||
| Issuance of shares of common stock, shares | 3,833,000 | 3,784,000 | 4,535,000 |
| Redemption of shares of common stock, shares | 119,000 | 109,000 | 43,000 |
| Cancellation shares of common stock, shares | 14,000 | ||
| Issuance of shares common stock upon conversion of membership units | 37,000 | ||
| X | ||||||||||
- Definition Cancellation shares of common stock, shares. No definition available.
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| X | ||||||||||
- Definition Membership units, new units issued during period. No definition available.
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| X | ||||||||||
- Definition Number of membership units exchanged. No definition available.
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| X | ||||||||||
- Definition The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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