Summary of Significant Accounting Policies - Fair Value Disclosures, Derivative Financial Instruments (Details)	Dec. 31, 2016 USD ($) land_parcel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer of assets between level 1 and level 2	$ 0
Number of parcels of land held-for-sale | land_parcel	2
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	$ 23,844,000
Other liabilities - Cash Flow Hedge Swap Agreements	(2,447,000)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	0
Other liabilities - Cash Flow Hedge Swap Agreements	0
Significant Other Observable Inputs (Level 2) [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	23,844,000
Other liabilities - Cash Flow Hedge Swap Agreements	(2,447,000)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	0
Other liabilities - Cash Flow Hedge Swap Agreements	$ 0