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Income Taxes - Tax Credit Carryforwards (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Federal  
Income Taxes  
Operating loss carryforwards $ 438,384
Federal | General  
Income Taxes  
Tax credit carryforwards 5,572
State  
Income Taxes  
Operating loss carryforwards 336,251
Foreign  
Income Taxes  
Operating loss carryforwards $ 58,090