Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Current income tax benefit	$ 423	$ 628
Unrecognized tax benefits - beginning of year	1,381	1,367	$ 1,274
Gross additions - current year tax positions	0	0
Gross additions - prior year tax positions	14	93
Gross reductions - prior year tax positions	0	0
Gross reductions - settlements with taxing authorities	0	0
Impact due to expiration of statute of limitations	0	0
Deferred income tax benefit	(108)	(17,316)
Income tax benefit	315	(16,688)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	200	500
Income Tax Examination, Penalties and Interest Accrued	$ 1,100	$ 900