Schedule III - Real Estate and Accumulated Depreciation and Amortization Real Estate - Held for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	$ 6,647,597	$ 5,913,547	$ 5,236,251	$ 4,686,844
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	742,467	$ 624,607	$ 513,175	$ 418,136
SunTrust Cape Coral, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	1,065
Assets Held-for-sale
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	16,520
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	15,467
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	13,008
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	13,805
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	26,813
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	2,963
Assets Held-for-sale | Applebee's Mesa, AZ 1
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	974
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,514
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	974
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	1,514
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	2,488
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 313
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	30 years
Assets Held-for-sale | CarQuest Bellevue, NE
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	29
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	142
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	29
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	142
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	171
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 43
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	20 years
Assets Held-for-sale | Chipotle Hadley, MA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	45
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	505
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	$ 505
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	0 years
Assets Held-for-sale | Power Center Woodstock, GA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	261
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	701
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	260
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	492
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	752
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 117
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	40 years
Assets Held-for-sale | SunTrust Nashville, TN
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	679
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	394
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	679
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	394
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	1,073
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 259
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	5 years
Assets Held-for-sale | SunTrust Zephyrhills, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	267
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,301
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	267
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	1,301
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	1,568
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 143
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	30 years
Assets Held-for-sale | SunTrust Palm Harbor, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	836
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,139
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	836
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	1,139
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	1,975
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 188
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	20 years
Assets Held-for-sale | SunTrust Orlando, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	637
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,415
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	637
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	1,415
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	2,052
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 186
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	25 years
Assets Held-for-sale | SunTrust Raleigh, NC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	798
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,286
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	798
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	1,286
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	2,084
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 212
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	20 years
Assets Held-for-sale | SunTrust Cape Coral, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	1,065
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,032
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	1,032
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	2,097
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 170
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	20 years
Assets Held-for-sale | SunTrust Boca Raton, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	1,663
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	654
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	1,663
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	654
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	2,317
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 215
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	10 years
Assets Held-for-sale | SunTrust Washington, DC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	2,095
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	945
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	2,095
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	945
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	3,040
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 104
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	30 years
Assets Held-for-sale | SunTrust Hallandale Beach, FL
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	1,735
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	2,343
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	1,735
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	2,343
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	4,078
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 386
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	20 years
Assets Held-for-sale | SunTrust Chapel Hill, NC
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	323
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	541
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	323
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	541
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	864
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 119
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	15 years
Assets Held-for-sale | Vacant Land Hadley, MA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	2,824
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	5
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	$ 5
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	0 years
Assets Held-for-sale | Vacant Property Woodstock, GA
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	1,937
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	1,285
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	784
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	277
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	1,061
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 277
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	40 years
Assets Held-for-sale | Vacant Property Neosho, MO
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land	352
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests	775
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land	352
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests	330
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests	682
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization	$ 231
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed	18 years