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Note 10 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance at beginning of period $ 49,023 $ 43,562 $ 49,316 $ 41,785
Product warranty reserve assumed in acquisition 0 195 0 407
Payments (7,881) (5,657) (15,469) (11,291)
Provision for warranty issued 8,456 8,178 16,742 15,138
Changes in estimates for pre-existing warranties 726 (954) (265) (715)
Balance at end of period 50,324 45,324 50,324 45,324
Balance at beginning of period 80,880 70,844 78,738 68,340
Deferred revenue contracts issued 6,225 7,114 12,164 12,914
Amortization of deferred revenue contracts (3,952) (3,441) (7,749) (6,737)
Balance at end of period $ 83,153 $ 74,517 $ 83,153 $ 74,517