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Derivative instruments (Tables) | 6 Months Ended
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Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Company's Derivative Instruments, Weighted Average Maturities and Interest Rates | The Company’s derivative instruments consist of the following at June 30, 2013 and December 31, 2012:
|  |  | June 30, 2013 |  | December 31, 2012
| Balance Sheet Location |  | Notional Value |  | Estimated Fair Value |  | Notional Value |  | Estimated Fair Value
Interest rate swaps | Derivative instruments |  | $ | 63,365 |  |  | $ | (25 | ) |  | $ | 80,881 |  |  | $ | (156 | )
Interest rate caps | Derivative instruments |  | 105,635 |  | * | — |  |  | 203,248 |  | * | 1 |
Total derivative instruments |  |  |  |  | $ | (25 | ) |  |  |  | $ | (155 | )
* | Represents the notional values at June 30, 2013 and December 31, 2012, but does not include forward-starting notionals.
Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives | The following table summarizes the amounts recognized on the consolidated statements of operations related to the Company’s derivatives for the three and six months ended June 30, 2013 and 2012.
|  |  | Three months ended June 30, |  | Six months ended June 30,
| Location of Loss Recognized in Income |  | 2013 |  | 2012 |  | 2013 |  | 2012
Interest rate swaps | Loss on derivative instruments – realized * |  | $ | (59 | ) |  | $ | (257 | ) |  | $ | (133 | ) |  | $ | (669 | )
Interest rate swaps | Gain on derivative instruments – unrealized |  | 58 |  |  | 217 |  |  | 131 |  |  | 364 |
Interest rate caps | Loss on derivative instruments - unrealized |  | (1 | ) |  | (25 | ) |  | (1 | ) |  | (177 | )
Total |  |  | $ | (2 | ) |  | $ | (65 | ) |  | $ | (3 | ) |  | $ | (482 | )
* | Realized losses represent net amounts accrued for the Company’s derivative instruments during the period.
Summarizes Gross Asset and Liability Amounts Related to Derivatives | The following table summarizes the gross asset and liability amounts related to the Company’s derivatives at June 30, 2013 and December 31, 2012.
| June 30, 2013 |  | December 31, 2012
| Gross Amount of Assets Recognized as Liabilities |  | Gross Amounts Offset in the Statement of Financial Position |  | Net Amounts of Liabilities Presented in the Statement of Financial Position |  | Gross Amount of Assets Recognized as Liabilities |  | Gross Amounts Offset in the Statement of Financial Position |  | Net Amounts of Liabilities Presented in the Statement of Financial Position
Interest rate swaps | $ | — |  |  | $ | (25 | ) |  | $ | (25 | ) |  | $ | — |  |  | $ | (156 | ) |  | $ | (156 | )
Interest rate caps | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Total derivative instruments | $ | — |  |  | $ | (25 | ) |  | $ | (25 | ) |  | $ | 1 |  |  | $ | (156 | ) |  | $ | (155 | )

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41641-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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