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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Balance at beginning of period $ 45,324 $ 38,660 $ 41,785 $ 35,422
Product warranty reserve assumed in acquisition 0 0 407 0
Payments (7,576) (5,205) (18,867) (15,097)
Provision for warranty issued 8,518 8,074 23,656 19,552
Changes in estimates for pre-existing warranties 230 (974) (485) 678
Balance at end of period 46,496 40,555 46,496 40,555
Balance at beginning of period 74,517 63,007 68,340 57,854
Deferred revenue contracts issued 5,918 4,787 18,832 15,029
Amortization of deferred revenue contracts (3,573) (2,873) (10,310) (7,962)
Balance at end of period $ 76,862 $ 64,921 $ 76,862 $ 64,921