Equity - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2018 shares	Jul. 31, 2015 shares
Equity [Line Items]
Common shares, shares issued (in shares) | shares	247,856,209		235,008,554
Issuance of common shares, net | $	$ 131,831,000	$ 0
Authorized amount (in shares) | shares			10,000,000	10,000,000
Treasury stock acquired (in shares) | shares	441,581	1,871,655
Treasury stock acquired, average cost (in dollars per share) | $ / shares	$ 8.13	$ 8.01
Shares remaining available for repurchase (in shares) | $	$ 10,306,255
OP unit equivalent in common shares	1.13
Partners' capital account (in units) | shares	3,051,000
Share-based Payment Arrangement
Equity [Line Items]
Shares granted (in shares) | shares	54,726	57,055
Grant date fair value | $	$ 470,000	$ 518,000
At The Market
Equity [Line Items]
Sale of stock, authorized amount (up to) | $	$ 100,000,000
Common shares, shares issued (in shares) | shares	3,020,190	0
Issuance of common shares, net | $	$ 31,083,000
Common shares amount available for issuance | $	$ 68,366,000
Underwritten Offering
Equity [Line Items]
Common shares, shares issued (in shares) | shares	10,000,000
Issuance of common shares, net | $	$ 100,749,000
Common Stock | Underwritten Offering
Equity [Line Items]
Common shares, price per share (in dollars per share) | $ / shares	$ 10.09