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Derivative Instruments and Hedging Activities-Interest Rate Swaps (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |  |
Amount of loss recognized in OCI on derivative (effective portion) | $ 338 | $ 230 | $ 1,258 | $ 1,522 |
Amount of loss reclassified from accumulated OCI into income (effective portion) |  |  | 614 | $ 869 |
Accrued expenses and accounts payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate derivative at fair value | 1,197 |  | $ 1,197 |  | $ 553
Cash Flow Hedging | Interest Expense | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of loss reclassified from accumulated OCI into income (effective portion) | $ 302 | $ 434 |  |  |

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- Definition The effective portion of losses 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=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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