Credit Agreement Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Bank Overdrafts	$ 5,500
Secured Debt, Current		$ 0	$ 10,823
Credit Facility (Textual) [Abstract]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		$ 590	$ 1,036
Weighted average interest rate		4.59%
Letters of Credit Outstanding, Amount		$ 1,100
Maximum
Credit Facility (Textual) [Abstract]
Restricted Dividends	7,000
Revolving Credit Facility [Member]
Credit Facility (Textual) [Abstract]
Credit facility, borrowing capacity	$ 40,000	100,000
Letter of Credit [Member]
Credit Facility (Textual) [Abstract]
Credit facility, borrowing capacity		150,000
Lawson [Member]
Line of Credit Facility [Line Items]
Secured Debt, Current		2,271
Credit Facility (Textual) [Abstract]
Credit Facility, remaining borrowing capacity		$ 96,700
Required Minimum Value [Member]
Line of Credit Facility [Line Items]
Minimum Net Leverage Ratio		3.25
Required Minimum Value [Member] | Minimum
Line of Credit Facility [Line Items]
Minimum Net Leverage Ratio		1.00	1.00
Minimum
Line of Credit Facility [Line Items]
Minimum Net Leverage Ratio		3.75