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8. Accumulated Other Comprehensive Income (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other (income) expense, net $ (667,000) $ (1,511,000) $ (10,711,000) $ (14,692,000)  
Accumulated other comprehensive income 316,326,000   316,326,000   274,532,000
Total other comprehensive income (loss) net of tax 49,301,000 34,557,000 41,958,000 50,100,000  
Income Tax Expense (Benefit) 1,883,000 12,383,000 20,200,000 48,375,000  
Net Income (Loss) Attributable to Parent 7,099,000 (42,633,000) (47,654,000) (122,225,000)  
Accumulated Translation Adjustment [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income 177,800,000   177,800,000   172,900,000
Other comprehensive income before reclassifications, net of tax     5,100,000    
Reclassification from accumulated other comprehensive income, net of tax     (200,000)    
Total other comprehensive income (loss) net of tax     4,900,000    
Accumulated Defined Benefit Plans Adjustment [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (8,100,000)   (8,100,000)   (8,100,000)
Other comprehensive income before reclassifications, net of tax     0    
Reclassification from accumulated other comprehensive income, net of tax     0    
Total other comprehensive income (loss) net of tax     0    
Accumulated Net Unrealized Investment Gain (Loss) [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income 146,600,000   146,600,000   109,700,000
Other comprehensive income before reclassifications, net of tax     36,700,000    
Reclassification from accumulated other comprehensive income, net of tax     200,000    
Total other comprehensive income (loss) net of tax     36,900,000    
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other (income) expense, net     200,000    
Income Tax Expense (Benefit)     0    
Net Income (Loss) Attributable to Parent     200,000    
Parent [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income 316,300,000   316,300,000   274,500,000
Other comprehensive income before reclassifications, net of tax     41,800,000    
Reclassification from accumulated other comprehensive income, net of tax     0    
Total other comprehensive income (loss) net of tax     41,800,000    
Noncontrolling Interest [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income 0   0   (200,000)
Other comprehensive income before reclassifications, net of tax     0    
Reclassification from accumulated other comprehensive income, net of tax     200,000    
Total other comprehensive income (loss) net of tax     200,000    
Accumulated Other Comprehensive Income (Loss) [Member]
          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income 316,300,000   316,300,000   274,300,000
Other comprehensive income before reclassifications, net of tax     41,800,000    
Reclassification from accumulated other comprehensive income, net of tax     200,000    
Total other comprehensive income (loss) net of tax     $ 42,000,000