Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	182,416,007	181,440,051
Common stock, shares outstanding (in shares)	182,416,007	181,440,051
Operating Partnership
Partners' Capital, Number of Units, Par Value and Other Disclosures [Abstract]
General Partner units issued (in units)	182,416,007	181,440,051
General Partner units outstanding (in units)	182,416,007	181,440,051
Limited Partner units issued (in units)	5,182,784	5,364,632
Limited Partner units outstanding (in units)	5,182,784	5,364,632