Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 USD ($) $ / shares shares	Jul. 31, 2015 shares
Equity [Line Items]
Proceeds from issuance of common shares | $	$ 16,168	$ 3,751
Authorized amount (in shares)			10,000,000
Treasury stock acquired (in shares)	0	1,184,113
Treasury stock acquired, average cost (in dollars per share) | $ / shares		$ 7.56
OP unit equivalent in common shares	1.13
Partners' capital account (in units)	3,350,000
Performance Shares [Member]
Equity [Line Items]
Common shares issued during period (in shares)	326,929
At The Market [Member]
Equity [Line Items]
Common shares issued during period (in shares)	1,593,603
Proceeds from issuance of common shares | $	$ 17,362
Direct Share Purchase Plan [Member]
Equity [Line Items]
Common shares issued during period (in shares)		577,823
Proceeds from issuance of common stock, net | $		$ 4,115