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Income Taxes, Deferred Tax Valuation Allowance (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred tax valuation allowance, rollfoward      
Reduction of current deferred income tax assets due to valuation allowance $ 1,000,000    
Reduction of noncurrent deferred income tax assets due to valuation allowance 29,300,000    
Deferred tax asset valuation allowance
      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of period 29,891,000 19,234,000 23,565,000
Charged to Costs and Expenses (1,450,000) (832,000) (10,348,000)
Charged to Other Accounts 1,820,000 11,489,000 6,017,000
Balance at end of period $ 30,261,000 [1] $ 29,891,000 $ 19,234,000
[1] As of December 31, 2011, the valuation allowance reduced current deferred tax assets by $1.0 million and noncurrent deferred tax assets by $29.3 million.