Income Taxes, Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Uncertain Tax Positions [Abstract]
Unrecognized tax benefits that affect our effective tax rate	$ 600
Interest and penalties related to unrecognized tax benefits	0	$ 0
Changes in Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of period	0	0
Increases (decreases) in 2016		0
Increases based upon tax positions related to prior years	644
Balance, end of period	$ 644	$ 0
Open tax year	2014