Income Taxes Provisional estimated income tax effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	21.00%
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment		$ 18,000
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 4,562	3,169
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount		18,100
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 0	(105,600)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 100