Debt - Summary of the Balance of Indebtedness (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal Amount	$ 455,000	$ 400,022
Deferred Loan Fees	(5,284)	(6,117)
Carrying Value	449,716	393,905
Senior unsecured notes payable [Member]
Debt Instrument [Line Items]
Principal Amount	260,000	260,000
Deferred Loan Fees	(4,706)	(5,771)
Carrying Value	255,294	254,229
Senior unsecured term loan [Member]
Debt Instrument [Line Items]
Principal Amount	100,000	0
Deferred Loan Fees	(578)	0
Carrying Value	99,422	0
Unsecured revolving credit facility [Member]
Debt Instrument [Line Items]
Principal Amount	95,000	45,000
Deferred Loan Fees	0	0
Carrying Value	95,000	45,000
Mortgage notes payable [Member]
Debt Instrument [Line Items]
Principal Amount	0	95,022
Deferred Loan Fees	0	(346)
Carrying Value	$ 0	$ 94,676