Income Taxes Uncertain Tax Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at December 31, 2016	$ 499,000	$ 499,000
Additions based on tax positions related to the current year	0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0
Interest and penalties on unrecognized tax benefits	23,000	0	$ 0
Balance at December 31, 2017	$ 522,000	$ 499,000	$ 499,000