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Income Taxes, Deferred Tax Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred tax valuation allowance, rollfoward      
Balance at beginning of period $ 113,553    
Balance at end of period 112,357 $ 113,553  
Deferred tax asset valuation allowance      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of period 113,553 79,064 $ 70,502
Charged (credited) to income tax expense (1,196) 34,489 1,954
Charged to other accounts     6,608
Balance at end of period $ 112,357 $ 113,553 $ 79,064