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Long-Term Debt (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
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