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Schedule I - Condensed Financial Information of Registrant - Notes to Condensed Financial Statements (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
2007 Debenture Transaction Summary      
Principal amounts converted or acquired $ 26,900,000 $ 2,500,000 $ 11,100,000
Cash paid for acquisitions   2,494,000 8,938,000
Shares of LSB common stock issued 979,160    
Parent Company [Member]
      
2007 Debenture Transaction Summary      
Principal amounts converted or acquired 26,900,000 2,500,000 11,100,000
Cash paid for acquisitions $ 0 $ 2,494,000 $ 8,938,000
Shares of LSB common stock issued 979,160 0 0