The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Real Estate Assets - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) land_parcel property	Dec. 31, 2015 USD ($) property	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Number of parcels of land held-for-sale \| land_parcel	2
Number of stores \| property	99	171
Amortization period of intangible assets-tenant relationships	18 months
Amortization expense related to the tenant relationships and lease rights \| $	$ 21,133	$ 11,695	$ 12,996
Minimum [Member]
Real Estate Properties [Line Items]
Remaining amortization period (in years)	2 years
Maximum [Member]
Real Estate Properties [Line Items]
Remaining amortization period (in years)	45 years