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Note 10 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Balance at beginning of period $ 38,660 $ 32,813 $ 35,422 $ 31,695
Product warranty reserve assumed in acquisition 43
Payments (5,205) (5,135) (15,097) (13,980)
Provision for warranty issued 8,074 6,206 19,552 14,452
Changes in estimates for pre-existing warranties (974) (705) 678 969
Balance at end of period 40,555 33,179 40,555 33,179
Balance at beginning of period 63,007 43,356 57,854 36,139
Deferred revenue contracts issued 4,787 12,741 15,029 23,204
Amortization of deferred revenue contracts (2,873) (1,908) (7,962) (5,154)
Balance at end of period $ 64,921 $ 54,189 $ 64,921 $ 54,189