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Derivative instruments - Company's Derivative Instruments, Weighted Average Maturities and Interest Rates (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Estimated Fair Value | $ (25) |  | $ (155) |
Interest rate swaps [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional Value | 63,365 |  | 80,881 |
Estimated Fair Value | (25) |  | (156) |
Interest rate caps [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional Value | 105,635 | [1] | 203,248 | [1]
Estimated Fair Value | $ 0 |  | $ 1 |
[1] | Represents the notional values at June 30, 2013 and December 31, 2012, but does not include forward-starting notionals.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Details
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