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Commitments And Contingencies (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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Commitments And Contingencies [Abstract] |  |
Like-kind exchange deposits and reverse exchange property | $ 21,959,000 | $ 35,359,000
Like-kind exchange funds invested in auction rate securities | $ 1,000,000 |

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- Definition Like-kind exchange deposits and reverse exchange property + References No definition available. + Details
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- Definition Like Kind Exchange Funds Invested In Auction Rate Securities + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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