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Fair Value (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Derivative instruments and Hedging Activities |  |  |  |  |  |
Hedging losses reclassified from accumulated other comprehensive income into earnings | $ 1,438 |  | $ 1,574 | $ 3,011 |  | $ 2,965
Non-Designated Hedges |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |
Notional balance | 609,960 |  |  | 609,960 |  |
Weighted average interest rate (as a percent) | 1.70% | [1] |  | 1.70% | [1] |
Weighted average capped interest rate (as a percent) | 5.90% |  |  | 5.90% |  |
Number of derivative instruments held | 14 |  |  | 14 |  |
Unrecognized gain on derivatives |  |  | 1,069 |  |  | 2,484
Cash Flow Hedges |  |  |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |  |  |
Notional balance | 171,691 |  |  | 171,691 |  |
Weighted average interest rate (as a percent) | 2.00% | [1] |  | 2.00% | [1] |
Weighted average capped interest rate (as a percent) | 5.10% |  |  | 5.10% |  |
Number of derivative instruments held | 4 |  |  | 4 |  |
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months |  |  |  | $ 5,493 |  |
[1] | Represents the weighted average interest rate on the hedged debt.

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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by interest rate caps and interest rate swaps at that time. + 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 Average cap rate on a group of interest rate derivatives, such as interest rate caps or collars. 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 estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + 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=35706170&loc=SL5624171-113959 + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: 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=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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