Debt - Schedule of Maturities of Long-term Debt (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Maturities of Long-term Debt [Abstract]
2016	$ 160,999,000
2017	42,000,000
2018	0
2019	0
2020	112,000,000
Thereafter	518,242,000
Total debt	833,241,000
Mortgage notes due 2017 at fixed interest rates of 4.35%
Maturities of Long-term Debt [Abstract]
Unamortized premium	600,000	$ 1,300,000
Amount due upon maturity	$ 42,000,000