Schedule III - Real Estate and Accumulated Depreciation Reconciliation of Investment Properties (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance, beginning of year	$ 1,649,423us-gaap_RealEstateGrossAtCarryingValue	$ 939,330us-gaap_RealEstateGrossAtCarryingValue	$ 856,151us-gaap_RealEstateGrossAtCarryingValue
Acquisition of new properties	354,429us-gaap_RealEstateOtherAcquisitions	607,779us-gaap_RealEstateOtherAcquisitions	0us-gaap_RealEstateOtherAcquisitions
Improvements	143,315us-gaap_RealEstateImprovements	130,346us-gaap_RealEstateImprovements	85,409us-gaap_RealEstateImprovements
Distribution of real property to owners prior to the formation transactions	0	(16,345)	0
Disposals	(7,304)us-gaap_RealEstateCostOfRealEstateSold	(11,687)us-gaap_RealEstateCostOfRealEstateSold	(2,230)us-gaap_RealEstateCostOfRealEstateSold
Balance, end of year	2,139,863us-gaap_RealEstateGrossAtCarryingValue	1,649,423us-gaap_RealEstateGrossAtCarryingValue	939,330us-gaap_RealEstateGrossAtCarryingValue
Aggregate cost of investment properties for federal income tax purpose	$ 1,843,184us-gaap_RealEstateFederalIncomeTaxBasis

SEC Schedule III, Real Estate, Distribution of Real Estate to Prior Owners

No definition available.

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- Definition

Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN6)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

+ Details

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Balance Type:	debit
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- Definition

Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

+ Details

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- Definition

Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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