Commitments and Contingent Liabilites (Tables)

3 Months Ended

Mar. 31, 2013

Commitments and Contingent Liabilities [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

		Warranty Liability
Balance at December 31, 2012	$	15,727
Additions to warranty liability		311
Warranty liability utilized		(937)
Balance at March 31, 2013	$	15,101