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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Accounts and rents receivable, allowance | $ 1,868 | $ 864
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized (in shares) | 40,000,000 | 40,000,000
Preferred stock, shares outstanding (in shares) | 0 | 0
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 1,460,000,000 | 1,460,000,000
Common stock, shares issued (in shares) | 773,520,541 | 773,304,997
Common stock, shares outstanding (in shares) | 773,520,541 | 773,304,997

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