Other Assets - Summary of Future Amortization of Deferred Leasing Costs and Capitalized Lease Incentives (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Costs, Leasing, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	$ 22,515
2016	18,867
2017	16,745
2018	14,380
2019	12,287
Thereafter	41,458
Deferred Costs Leasing, Net, Properties Held and Used in Operations	126,252	100,768
Capitalized Lease Incentives, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	2,514
2016	2,471
2017	2,386
2018	2,292
2019	2,121
Thereafter	3,407
Capital Lease Incentives, Net, Properties Held and Used in Operations	$ 15,191	$ 15,259