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Changes in Operations (Details 3)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2011
USD ($)
Jun. 30, 2010
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2010
USD ($)
Sep. 30, 2010
HCRY [Member]
USD ($)
Jun. 30, 2009
HCRY [Member]
USD ($)
Jun. 30, 2011
HCRY [Member]
USD ($)
Jun. 30, 2011
HCRY [Member]
CAD
Restructuring Cost and Reserve [Line Items]                
HCRY impairment and restructuring charges, net of tax           $ 5,400,000    
HCRY loss on write-down           6,700,000    
Restructuring charges           2,300,000    
HCRY income tax benefit 11,420,000 12,067,000 19,905,000 21,708,000   (3,600,000)    
Amounts pledged by the governments             31,100,000 30,000,000
Expected payments for capital improvements             3,000,000 3,000,000
Reversal of accrued restructuring charges         2,300,000      
Reversal of accrued restructuring charges after tax         $ 1,500,000