Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments in Real Estate and Real Estate Under Construction [Line Items]
Buildings and building improvements	$ 3,050,082	$ 3,032,457
Land, land estates and land improvements	472,394	743,125
Fixtures and equipment	5,577	5,577
Construction in progress	5,119	8,552
Real estate - intangible assets	597,294	692,778
Investments in real estate under construction	106,652	95,402
Real estate, gross	4,237,118	4,577,891
Accumulated depreciation and amortization	(1,208,792)	(1,179,969)
Real estate, net	3,028,326	3,397,922
Accumulated amortization	363,861	367,762
Amortization expense, next 12 months	30,919
Amortization expense, year 2	26,664
Amortization expense, year 3	21,742
Amortization expense, year 4	17,598
Amortization expense, year 5	16,135
Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	436,185	513,564
Customer Relationships [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	113,839	123,796
Above Market Leases [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	47,270	55,418
LCIF [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Buildings and building improvements	644,173	705,547
Land, land estates and land improvements	86,120	355,608
Fixtures and equipment	84	84
Construction in progress	825	367
Real estate - intangible assets	104,761	189,700
Investments in real estate under construction	40,443	9,223
Real estate, gross	876,406	1,260,529
Accumulated depreciation and amortization	(236,930)	(255,024)
Real estate, net	639,476	1,005,505
Accumulated amortization	54,425	55,334
Amortization expense, next 12 months	4,767
Amortization expense, year 2	4,215
Amortization expense, year 3	3,466
Amortization expense, year 4	3,353
Amortization expense, year 5	3,339
LCIF [Member] | Leases, Acquired-in-Place [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	82,190	165,413
LCIF [Member] | Customer Relationships [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	19,943	20,256
LCIF [Member] | Above Market Leases [Member]
Investments in Real Estate and Real Estate Under Construction [Line Items]
Real estate - intangible assets	$ 2,628	$ 4,031