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Shareholders' Equity (Details)					1 Months Ended		12 Months Ended
	Mar. 01, 2018 shares	Mar. 01, 2017 shares	Jan. 28, 2016 shares	Jun. 01, 2015 shares	Dec. 31, 2017 USD ($) $ / shares shares	Jan. 31, 2014 USD ($)	Dec. 31, 2018 USD ($) vote $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares
Stockholders Equity Note Disclosure [Line Items]
Common shares, shares authorized (up to) (in shares)					500,000,000		500,000,000	500,000,000
Common shares, par value (in dollars per share) | $ / shares					$ 0.01		$ 0.01	$ 0.01
Number of votes per common share | vote							1
Common shares, shares outstanding (in shares)					45,375,266		46,525,652	45,375,266
Proceeds from issuance of common shares | $							$ 24,486,000	$ 150,691,000	$ 482,000
Preferred shares, shares authorized (up to) (in shares)					100,000,000		100,000,000	100,000,000
Preferred shares, par value (in dollars per share) | $ / shares					$ 0.01		$ 0.01	$ 0.01
Preferred stock, shares outstanding (in shares)					0		0	0
Operating partnership common units held by unaffiliated third parties (in shares)					0		0	0
Long Term Incentive Plan Units
Stockholders Equity Note Disclosure [Line Items]
Percent of units with full parity that have vested							100.00%
Shares granted (in shares)				183,300			244,917	223,922	112,251
Class A Performance LTIP Units
Stockholders Equity Note Disclosure [Line Items]
Distribution entitlement (in percentage)				10.00%
Long Term Incentive Plan Units, Time-Based
Stockholders Equity Note Disclosure [Line Items]
Shares granted (in shares)	97,968	89,574	72,966
DRSP Plan
Stockholders Equity Note Disclosure [Line Items]
Additional common shares issued (in shares)							1,508,046	741,730
Stock purchase plan, authorized amount | $					$ 50,000,000	$ 25,000,000
Weighted average price per share (in dollars per share) | $ / shares							$ 21.55	$ 21.00
Remaining authorized repurchase amount | $							$ 32,500,000
New DRSPP
Stockholders Equity Note Disclosure [Line Items]
Additional common shares issued (in shares)							766,574
Weighted average price per share (in dollars per share) | $ / shares							$ 22.08
Proceeds from issuance of common shares | $							$ 16,900,000
ATM Plan
Stockholders Equity Note Disclosure [Line Items]
Common shares, shares outstanding (in shares)							350,975
Additional common shares issued (in shares)							2,498,670	2,147,695
Stock purchase plan, authorized amount | $					$ 100,000,000	$ 50,000,000
Weighted average price per share (in dollars per share) | $ / shares							$ 21.83	$ 21.87
Proceeds from issuance of common shares | $							$ 7,600,000
Remaining authorized repurchase amount | $							$ 92,400,000

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