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Commitments and Contingencies (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 investments | Dec. 31, 2011 | Dec. 31, 2010
Operating lease expense |  |  |
Total operating lease expense | $ 6,500,000 | $ 7,200,000 | $ 7,300,000
Future minimum lease obligations under non-cancelable operating leases |  |  |
2013 | 5,479,000 |  |
2014 | 4,835,000 |  |
2015 | 4,469,000 |  |
2016 | 4,582,000 |  |
2017 | 4,210,000 |  |
Thereafter | 9,265,000 |  |
Letters of credit issued |  |  |
Letters of credit issued | 12,600,000 |  |
Number of investments related to which letters of credit have been issued | 5 |  |
Legal settlement payment | $ 2,000,000 |  |

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