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Other Long-Term Liabilities
 6 Months Ended
Jun. 30, 2011
Other Long-Term Liabilities [Abstract]  
Other Long-Term Liabilities
11. Other Long-Term Liabilities
Other long-term liabilities consist of the following:
                 
    June 30,     December 31,  
    2011     2010  
    (in thousands)  
Environmental
  $ 11,779     $ 11,779  
Unrecognized tax benefits, interest and penalties
    2,003       2,659  
 
           
 
  $ 13,782     $ 14,438