Employee Benefits (Employee Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits [Abstract]
Health benefits, including premiums	$ 13,070	$ 13,603
401(k) matching	1,811	1,943
Deferred bonus plan	722	677
Employee benefit costs	$ 15,603	$ 16,223