Valuation and Qualifying Accounts (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables aging period	60 days
Accounts receivable reserve period	90 days
Allowance for doubtful accounts	$ 2,738	$ 3,077
Sales Discounts	16,724	15,005
Inventory obsolescence reserves	8,596	9,099
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	$ 4,994	$ 5,007
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	85.00%
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