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Joint Ventures (Tables) | 6 Months Ended
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Jun. 30, 2012
Balance of Investment in Joint Venture | As of December 31, 2011 and June 30, 2012, the balance of the investment in the joint venture includes the following components (in thousands):
|  | December 31, |  |  | June 30, |
|  | 2011 |  |  | 2012 |
Capital Contributions, net of distributions |  | $ | 2,826 |  |  | $ | 3,507 |
Equity in cumulative net loss |  |  | (90) |  |  |  | (212) |
Investment in joint venture |  | $ | 2,736 |  |  | $ | 3,295 |

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- Definition A table of investments, shown as a text block. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
Name: | invest_InvestmentTableTextBlock
Namespace Prefix: | invest_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration