Income Taxes - Changes in Unrecognized Tax Benefits (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Changes in unrecognized tax benefits [Roll Forward]
Balance at beginning of period	$ 1,105
Change due to tax positions taken during the current year	282
Change due to tax positions taken during a prior year	56
Change due to the lapse of applicable statute of limitations during the current year	(194)
Change due to settlements with taxing authorities during the current year	0
Balance at end of period	1,249
Accrued interest, net of federal benefit, at end of period	212
Unrecognized tax benefits that would impact the effective tax rate, if recognized, at end of period	$ 988