Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2015 shares
Equity [Line Items]
Proceeds from issuance of common shares | $	$ 222,390	$ 197,643	$ (2,818)
Shares issued, net of forfeitures (in shares)	756,380	896,807	965,932
Number of shares authorized to be repurchased (in shares)				10,000,000
Remaining authorized repurchase amount (in shares)	8,976,315
OP unit equivalent in common shares (in unit per share)	1.13
Shares issued for units redeemed (in shares)	327,453	391,993	53,388
Partners' capital account, exchanges and conversions | $	$ 1,614	$ 1,655	$ 189
OP units outstanding (in units)	2,538,000
Common Stock
Equity [Line Items]
Number of shares authorized to be repurchased (in shares)			10,000,000
Repurchase of common shares (in shares)	1,329,940	441,581	5,851,252
Average cost per share (in dollars per share) | $ / shares	$ 8.28	$ 8.13	$ 8.05
At The Market
Equity [Line Items]
Sale of stock, amount available for issuance | $	$ 177,212
At The Market | Forward Contracts
Equity [Line Items]
Common stock, number of shares to be settled on forward basis (in shares)	4,990,717	0	0
Common stock, shares to be settled on forward basis, aggregate value | $	$ 55,120
Underwritten Offering
Equity [Line Items]
Sale of stock, number of shares issued (in shares)	17,250,000	10,000,000
Sale of stock (in dollars per share) | $ / shares	$ 9.60	$ 10.09
Proceeds from issuance of common shares | $	$ 164,000	$ 100,749