Commitments and Contingent Liabilites (Tables)

6 Months Ended

Jun. 30, 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		829
Warranty liability utilized		(4,741)
Balance at June 30, 2013	$	11,815