Valuation and Qualifying Accounts (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables aging period	60 days
Accounts receivable reserve period	90 days
Allowance for doubtful accounts	$ 3,484	$ 2,853
Reserves for sales discounts	15,094	15,999
Inventory obsolescence reserves	$ 9,675	7,601
Inventory usage period	3 years
Inventory reserve percentage	100.00%
Product warranty accrual period of expenses used in calculation	12 months
Product warranty accrual period for sales used in calculation	12 months
Warranty	$ 5,566	$ 5,913
Wholegood Units
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product warranty period	1 year
Parts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Product warranty period	90 days
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales discount percentage of customers who qualify for each program that discount available	90.00%
Product warranty accrual lag period	90 days
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales discount percentage of customers who qualify for each program that discount available	95.00%
Product warranty accrual lag period	6 months