Capital and Financing Transactions - Summary of Interest Rate Hedge Contracts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Account payable and other liabilities
Derivative [Line Items]
Asset (Liability) Balance	$ (8,552,000)	$ (9,945,000)
Swap 1 | Receivables and Other Assets
Derivative [Line Items]
Notional Amount	$ 50,000,000
Maturity Date	Sep. 27, 2017
Reference Rate	1-month LIBOR
Fixed Rate	0.699%
Asset (Liability) Balance	$ 190,000	452,000
Term loan period	5 years
Swap 2 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 120,000,000
Maturity Date	Jun. 11, 2018
Reference Rate	1-month LIBOR
Fixed Rate	1.6075%
Asset (Liability) Balance	$ (1,515,000)	(1,438,000)
Term loan period	5 years
Swap 3 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 13,475,000
Maturity Date	Oct. 08, 2018
Reference Rate	1-month LIBOR
Fixed Rate	3.349%
Asset (Liability) Balance	$ (68,000)	(18,000)
Swap 4 | Receivables and Other Assets
Derivative [Line Items]
Notional Amount	$ 75,000,000
Maturity Date	Sep. 27, 2017
Reference Rate	1-month LIBOR
Fixed Rate	0.699%
Asset (Liability) Balance	$ 284,000	679,000
Term loan period	5 years
Swap 5 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 4,316,000
Maturity Date	Jan. 25, 2018
Reference Rate	1-month LIBOR
Fixed Rate	1.692%
Asset (Liability) Balance	$ (61,000)	(71,000)
Swap 6 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 21,536,000
Maturity Date	Jan. 25, 2018
Reference Rate	1-month LIBOR
Fixed Rate	4.50%
Asset (Liability) Balance	$ (655,000)	(877,000)
Swap 7 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 41,747,000
Maturity Date	Jan. 25, 2018
Reference Rate	1-month LIBOR
Fixed Rate	1.46%
Asset (Liability) Balance	$ (392,000)	(413,000)
Swap 8 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 9,166,000
Maturity Date	Sep. 30, 2018
Reference Rate	1-month LIBOR
Fixed Rate	5.245%
Asset (Liability) Balance	$ 0	(617,000)
Swap 9 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 22,016,000
Maturity Date	Oct. 08, 2018
Reference Rate	1-month LIBOR
Fixed Rate	5.372%
Asset (Liability) Balance	$ (1,295,000)	(1,613,000)
Swap 10 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 22,100,000
Maturity Date	Nov. 18, 2018
Reference Rate	1-month LIBOR
Fixed Rate	5.00%
Asset (Liability) Balance	$ 0	(1,317,000)
Swap 11 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 5,000
Maturity Date	Apr. 01, 2019
Reference Rate	1-month LIBOR
Fixed Rate	1.737%
Asset (Liability) Balance	$ (76,000)	(60,000)
Term loan period	5 years
Swap 12 | Account payable and other liabilities
Derivative [Line Items]
Notional Amount	$ 100,000
Maturity Date	Mar. 31, 2021
Reference Rate	1-month LIBOR
Fixed Rate	2.556%
Asset (Liability) Balance	$ (4,964,000)	$ (4,652,000)
Term loan period	7 years