Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Tax Cuts and Jobs Act Of 2017, provisional tax expense   $ 5,100,000 $ 95,600,000
Tax Cuts and Jobs Act of 2017, provisional decrease to deferred tax assets   (1,500,000) 15,000,000.0
Tax Cuts and Jobs Act Of 2017, provisional transition tax obligation   5,400,000 49,900,000
Tax Cuts and Jobs Act Of 2017, provisional liability for withholding tax   1,600,000 23,700,000
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Foreign Tax Credit, Provisional Income Tax Expense   (600,000) 7,000,000.0
Net operating loss carryforwards $ 84,300,000    
Net operating loss carryforwards, not subject to expiration 73,500,000    
Net operating loss carryforwards, subject to expiration 10,800,000    
Deferred tax assets, net operating loss carryforwards 23,660,000 18,800,000  
Deferred tax assets, valuation allowance 21,900,000 16,500,000  
Undistributed earnings of foreign subsidiaries 420,600,000    
Change in unrecognized tax benefit reasonably possible, low range 0    
Change in unrecognized tax benefit reasonably possible, high range 1,900,000    
Unrecognized tax benefits that would affect the effective tax rate 11,500,000 9,100,000 6,900,000
Interest expense and penalties recognized (reversed) 500,000 400,000 $ 1,400,000
Income Tax Examination, Penalties and Interest Accrued $ 1,500,000 $ 2,100,000