Summary of Significant Accounting Policies - Finite-lived Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization of above (below) market leases	$ 2,210	$ 5,015	$ 2,695
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	166,756	118,097
Above and Below Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of above (below) market leases	2,200	5,000	2,700
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014	11,613
2015	7,385
2016	6,997
2017	6,121
2018	3,661
Thereafter	11,134
Total	46,911
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of above (below) market leases	26,900	15,000	11,100
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014	45,520
2015	26,386
2016	21,260
2017	15,175
2018	9,108
Thereafter	19,128
Total	$ 136,577