Real Estate Intangibles (Real Estate Intangible Maturity Schedule) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018, amortization expense	$ 61,540
2019, amortization expense	83,254
2020, amortization expense	54,511
2021, amortization expense	22,985
2022, amortization expense	17,996
Thereafter, amortization expense	144,073
Net book value	384,359	$ 377,034
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2018, amortization income	2,953
2019, amortization income	5,546
2020, amortization income	5,059
2021, amortization income	4,559
2022, amortization income	4,095
Thereafter, amortization income	16,485
Real Estate Intangible Liabilities Net	$ 38,697	$ 29,341