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Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Estimated amortization expense succeeding fiscal years |
2012 | $ 4,141
2013 | 3,796
2014 | 3,650
2015 | 3,616
2016 | 2,677
Thereafter | 1,030
Total Estimated amortization expense succeeding fiscal years | $ 18,910

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