Self-Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
General Liability Insurance Deductible	$ 7,500
Aggregate General Liability Deductible	10,000
Self Insurance Reserve	2,400	$ 1,800
General Insurance Expense	8,900	6,500	$ 6,100
Employee Health Care [Member]
Self-Insurance Limit	250
Employee Health Care Limit / Stop Loss coverage [Member]
Self-Insurance Limit	250
Workers Compensation Deductible [Member]
Workers Compensation	250
Maximum Incurred Losses not to Exceed - Ohio [Member]
Workers Compensation	500
Deductible for all other types of claims [Member]
General Liability Insurance Deductible	$ 250	$ 500