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Income Taxes, Deferred Tax Valuation Allowance (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax valuation allowance, rollfoward      
Deferred tax assets, valuation allowance, current $ 3,000,000    
Deferred tax assets valuation allowance noncurrent 40,392,000 40,208,000  
Deferred tax asset valuation allowance
      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of period 41,295,000 30,261,000 29,891,000
Charged to income tax expense (1,527,000) 3,033,000 (1,450,000)
Charged to other accounts 3,607,000 8,001,000 1,820,000
Balance at end of period $ 43,375,000 $ 41,295,000 $ 30,261,000