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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Balance at beginning of period $ 36,319 $ 32,008 $ 35,422 $ 31,695
Product warranty reserve assumed in acquisition 43
Payments (4,907) (4,285) (9,892) (8,845)
Provision for warranty issued 6,275 4,086 11,478 8,246
Changes in estimates for pre-existing warranties 973 1,004 1,652 1,674
Balance at end of period 38,660 32,813 38,660 32,813
Balance at beginning of period 60,113 37,562 57,854 36,139
Deferred revenue contracts issued 5,526 7,442 10,242 10,463
Amortization of deferred revenue contracts (2,632) (1,648) (5,089) (3,246)
Balance at end of period $ 63,007 $ 43,356 $ 63,007 $ 43,356