2.4.0.82404406 - Disclosure - 2. Significant Accounting Policies Schedule of Above and Below Market Lease Intangibles (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$I2013Q2http://www.sec.gov/CIK0001407739instant2013-06-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$I2012Q4http://www.sec.gov/CIK0001407739instant2012-12-31T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 1us-gaap_AccountingPoliciesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Accounting Policies [Abstract]2false 2us-gaap_FiniteLivedIntangibleAssetOffMarketLeaseFavorableGrossus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2310000023100USD$falsetruefalse2truefalsefalse2310000023100USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis element represents the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.15) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false2Lease contracts above market value3false 2us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortizationus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedTerseLabel1truefalsefalse-13396000-13396falsefalsefalse2truefalsefalse-12845000-12845falsefalsefalsexbrli:monetaryItemTypemonetaryAccumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Accumulated amortization4false 2us-gaap_FiniteLivedIntangibleAssetsNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse97040009704falsefalsefalse2truefalsefalse1025500010255falsefalsefalsexbrli:monetaryItemTypemonetaryAmount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Lease contracts above market value, net5false 2dft_OffMarketLeaseUnfavorableGrossdft_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3937500039375falsefalsefalse2truefalsefalse3937500039375falsefalsefalsexbrli:monetaryItemTypemonetaryOff Market Lease Unfavorable GrossNo definition available.false2Lease contracts below market value6false 2dft_OffMarketLeaseUnfavorableAccumulatedAmortizationdft_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedTerseLabel1truefalsefalse-27099000-27099falsefalsefalse2truefalsefalse-25353000-25353falsefalsefalsexbrli:monetaryItemTypemonetaryOff Market Lease Unfavorable Accumulated AmortizationNo definition available.false2Accumulated amortization7false 2us-gaap_OffMarketLeaseUnfavorableus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse1227600012276USD$falsetruefalse2truefalsefalse1402200014022USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Lease contracts below market value, netfalse2. Significant Accounting Policies Schedule of Above and Below Market Lease Intangibles (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.dft.com/role/A2SignificantAccountingPoliciesScheduleOfAboveAndBelowMarketLeaseIntangiblesDetails27