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Long-Term Debt (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Summary of Acquisition Transactions |  |  |
Principal amounts converted or acquired | $ 26,900 | $ 2,500 | $ 11,100
Cash paid for acquisitions |  | $ 2,494 | $ 8,938
Shares of LSB common stock issued | 979,160 |  |

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