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Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |
Impairment charges | $ 0us-gaap_AssetImpairmentCharges | $ 0us-gaap_AssetImpairmentCharges | $ 0us-gaap_AssetImpairmentCharges
Unrecorded impairment losses | $ 0skt_UnrecordedImpairmentLosses | $ 0skt_UnrecordedImpairmentLosses | $ 0skt_UnrecordedImpairmentLosses

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- Definition Unrecorded Impairment Losses + References No definition available. + Details
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Period Type: | instant

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- Details
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Period Type: | duration

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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