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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income and Comprehensive Income [Abstract]        
Net Income (Loss) $ 7,701 $ (17,356) $ 23,064 $ (10,113)
Unrealized Gain on Available-for-Sale Securities:        
Reversal of Previously Recognized Gains Realized on Sale ofInvestments and Included in Other Income During Period     (25)  
(Losses) Gains Arising During Period (80) 4 (85) 108
Income Tax Benefit (Expense) 28 (2) 39 (43)
Change in Unrealized Gains on Available-for-Sale Securities - net-of-tax (52) 2 (71) 65
Pension and Postretirement Benefit Plans:        
Amortization of Unrecognized Postretirement Benefit Losses and Costs (note 12) 146 102 291 204
Income Tax (Expense) (59) (40) (117) (81)
Pension and Postretirement Benefit Plans - net-of-tax 87 62 174 123
Total Other Comprehensive Income 35 64 103 188
Total Comprehensive Income $ 7,736 $ (17,292) $ 23,167 $ (9,925)