Commitments and Contingent Liabilites (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingent Liabilities [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

		Warranty Liability
Balance at December 31, 2011	$	6,632
Additions to warranty liability		24,252
Warranty liability utilized		(15,157)
Balance at December 31, 2012	$	15,727
Additions to warranty liability		1,695
Warranty liability utilized		(9,939)
Balance at December 31, 2013	$	7,483