12. Commitments and Contingencies (Details) - Accrued Expenses in Excess of Product Warranty - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Total Product Warranty Accrual in Excess of Normal Product Warranty Liability	$ 26,500	$ 30,900
Product Warranty Accrual in Excess of Normal Product Warranty Current Liability	6,383	7,800
Product Warranty Accrual in Excess of Normal Product Warranty Noncurrent Liability	$ 20,111	$ 23,139