Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes - Additional Information (Details)

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Income Taxes Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax Credit Carryforward [Line Items]      
Income Tax Examination, Penalties and Interest Accrued $ 900 $ 1,100  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 1,239 5,727 $ 51,177
Domestic Tax Authority [Member]      
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards 269,300    
Tax Credit Carryforward, Amount 41,800    
Federal Alternative Minimum Tax Credit Carryforward 300    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 11,300 $ 51,200
State and Local Jurisdiction [Member]      
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards 86,400    
Tax Credit Carryforward, Amount 86,300    
Foreign Tax Authority [Member]      
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards 11,700    
Tax Credit Carryforward, Amount 5,700    
Deferred Tax Assets, Other Tax Carryforwards $ 24,500