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Other Liabilities
 12 Months Ended
Dec. 31, 2012
Other Liabilities [Abstract]  
Other Liabilities
Other Liabilities
(in thousands) December 31,
 
2012

 
2011

Environmental
 
$
33,825

 
$
49,959

Other
 
43,046

 
26,756

 
 
$
76,871

 
$
76,715