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3us-gaap_DerivativeInstrumentsGainLossLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative Instruments, Gain (Loss) [Line Items]3false 4us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNetus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-9413000-9413[1]USD$falsetruefalse2truefalsefalse-14911000-14911[2]USD$falsetruefalse3truefalsefalse-3066000-3066[1]USD$falsetruefalse4truefalsefalse-3237000-3237[2]USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 false2Amount of Gain (Loss) recognized in OCI on Derivative4false 4us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNetus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse513000513USD$falsefalsefalse2truefalsefalse-10581000-10581USD$falsefalsefalse3truefalsefalse25500002550USD$falsefalsefalse4truefalsefalse-16588000-16588USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 false2Amount of Gain (Loss) reclassified from Accumulated OCI into Income5false 4us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNetus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3800038USD$falsetruefalse2truefalsefalse-4125000-4125USD$falsetruefalse3truefalsefalse837000837USD$falsetruefalse4truefalsefalse-6972000-6972USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 false2Amount of Gain (Loss) recognized in Income on Derivative1Includes deferred gain on settled rollover derivatives amounting to $0.01 million and $0.61 million for three and six months ended June 30, 2013 respectively.2Includes deferred loss on settled rollover derivatives amounting to $0.9 million and gain of $6.9 million for three months and six months ended June 30, 2012 respectively.falseEffect of Derivative Instruments on 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