Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	182,027,309	181,440,051
Common stock, shares outstanding (in shares)	182,027,309	181,440,051
Operating Partnership
General partners' capital account, units issued (in units)	182,027,309	181,440,051
General partners' capital account, units outstanding (in units)	182,027,309	181,440,051
Limited partners' capital account, units issued (in units)	5,392,234	5,364,632
Limited partners' capital account, units outstanding (in units)	5,392,234	5,364,632

Face amount or stated value per share of common stock.

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