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Derivative Instruments Interest Rate Caps (Details) (USD $) |  |  |  |  | 6 Months Ended |  |  |  |  |  |  |  |
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Not Designated as Hedging Instrument [Member] Interest Rate Cap [Member] | Dec. 31, 2012 Not Designated as Hedging Instrument [Member] Interest Rate Cap [Member] | Jun. 30, 2013 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Years | Jun. 30, 2013 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Caps, Maturity Date, July 29, 2021, 2.50% [Member] | Dec. 31, 2012 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Caps, Maturity Date, July 29, 2021, 2.50% [Member] | Jun. 30, 2013 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Caps, Maturity Date, July 8, 2021, 2.50% [Member] | Dec. 31, 2012 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Caps, Maturity Date, July 8, 2021, 2.50% [Member] | Jun. 30, 2013 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Caps, Maturity Date, July 7, 2021, 2.50% [Member] | Dec. 31, 2012 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Caps, Maturity Date, July 7, 2021, 2.50% [Member] | Jun. 30, 2013 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Cap [Member] | Dec. 31, 2012 Derivative Counterparty, SunTrust [Member] Not Designated as Hedging Instrument [Member] Interest Rate Cap [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Interest Rate Swaps and Caps, Duration |  |  |  |  | 7 |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 27,000,000 |  | $ 12,000,000 |  | $ 40,000,000 |  | $ 79,000,000 |
Derivative, Cap Interest Rate |  |  |  |  | 2.50% |  |  |  |  |  |  |  |
Derivative instruments |  |  | 5,565,000 | 3,247,000 |  | 1,920,000 | 1,123,000 | 841,000 | 490,000 | 2,804,000 | 1,634,000 | 5,565,000 | 3,247,000
Derivative, Collateral, Obligation to Return Cash | $ 572,200,000 | $ 328,700,000 |  |  | $ 6,400,000 |  |  |  |  |  |  |  |

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- Definition Represents the number of years the interest rate swaps and caps have until maturity. + References No definition available. + Details
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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 Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + Details
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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + 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 a -Clause 1 -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 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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