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Income Taxes Income taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Provisional tax benefit   $ 7,599,000  
Incremental tax expense recognized   3,474,000  
Unrecognized Tax Benefit [Roll Forward]      
Beginning Balance $ 361,000 1,407,000 $ 1,407,000
Additions related to current period tax positions 1,150,000 0 0
Reductions for tax positions of prior years 0 (1,046,000) 0
Ending Balance 1,511,000 361,000 1,407,000
Valuation Allowance 649,000 0  
Deferred Tax Liabilities, Undistributed Foreign Earnings 2,597,000 2,422,000  
Deferred Income Tax Expense (Benefit) (2,822,000) (20,166,000) (7,262,000)
Unrecognized tax benefits that would impact the effective tax rate $ 1,511,000 $ 361,000 $ 1,407,000