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Real Estate (Schedule of Real Estate Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]    
Land and Land Improvements $ 1,326,957us-gaap_LandAndLandImprovements $ 1,286,989us-gaap_LandAndLandImprovements
Buildings and improvements 1,818,606us-gaap_InvestmentBuildingAndBuildingImprovements 1,933,645us-gaap_InvestmentBuildingAndBuildingImprovements
Less: accumulated depreciation and amortization (468,849)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization (424,453)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
Real estate, net 2,676,714star_RealEstateInvestmentPropertyHeldForUseNet 2,796,181star_RealEstateInvestmentPropertyHeldForUseNet
Real estate available and held for sale 285,982star_RealEstateAvailableAndHeldForSale 360,517star_RealEstateAvailableAndHeldForSale
Total real estate 2,962,696us-gaap_RealEstateInvestmentPropertyNet 3,156,698us-gaap_RealEstateInvestmentPropertyNet
Net Lease    
Real Estate Properties [Line Items]    
Land and Land Improvements 311,890us-gaap_LandAndLandImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
350,817us-gaap_LandAndLandImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
Buildings and improvements 1,240,593us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
1,346,071us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
Less: accumulated depreciation and amortization (364,323)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
(338,640)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
Real estate, net 1,188,160star_RealEstateInvestmentPropertyHeldForUseNet
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
1,358,248star_RealEstateInvestmentPropertyHeldForUseNet
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
Real estate available and held for sale 4,521star_RealEstateAvailableAndHeldForSale
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
0star_RealEstateAvailableAndHeldForSale
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
Total real estate 1,192,681us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
1,358,248us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
Operating Properties    
Real Estate Properties [Line Items]    
Land and Land Improvements 146,417us-gaap_LandAndLandImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
132,934us-gaap_LandAndLandImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
Buildings and improvements 578,013us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
587,574us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
Less: accumulated depreciation and amortization (96,159)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
(82,420)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
Real estate, net 628,271star_RealEstateInvestmentPropertyHeldForUseNet
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
638,088star_RealEstateInvestmentPropertyHeldForUseNet
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
Real estate available and held for sale 162,782star_RealEstateAvailableAndHeldForSale
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
228,328star_RealEstateAvailableAndHeldForSale
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
Total real estate 791,053us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
866,416us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertyMember
Land    
Real Estate Properties [Line Items]    
Land and Land Improvements 868,650us-gaap_LandAndLandImprovements
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
803,238us-gaap_LandAndLandImprovements
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
Buildings and improvements 0us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
0us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
Less: accumulated depreciation and amortization (8,367)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
(3,393)star_RealEstateInvestmentPropertyAccumulatedDepreciationAndAmortization
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
Real estate, net 860,283star_RealEstateInvestmentPropertyHeldForUseNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
799,845star_RealEstateInvestmentPropertyHeldForUseNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
Real estate available and held for sale 118,679star_RealEstateAvailableAndHeldForSale
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
132,189star_RealEstateAvailableAndHeldForSale
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
Total real estate $ 978,962us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
$ 932,034us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember