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Derivative Instruments - Designated as hedging, Financial Performance (Details) (Interest Rate Swap [Member], Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Interest Expense [Member] | Sep. 30, 2012 Interest Expense [Member] | Sep. 30, 2013 Interest Expense [Member] | Sep. 30, 2012 Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | $ 2,930 | $ (760) |  |  |  |
Amount of Loss Reclassified from AOCI into Earnings |  |  | $ (240) | $ (140) | $ (560) | $ (250)

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- Definition The 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. + References 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 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References 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 + Details
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