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Note 10 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Balance at beginning of period $ 41,785 $ 35,422
Product warranty reserve assumed in acquisition 212
Payments (5,634) (4,985)
Provision for warranty issued 6,960 5,203
Changes in estimates for pre-existing warranties 239 679
Balance at end of period 43,562 36,319
Balance at beginning of period 68,340 57,854
Deferred revenue contracts issued 5,800 4,716 [1]
Amortization of deferred revenue contracts (3,296) (2,457)
Balance at end of period $ 70,844 $ 60,113
[1] The increase in deferred revenue contracts issued during 2017 was largely due to the launch of a post-sale extended warranty Marketing program.