XML 57 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
WARRANTY COSTS AND OTHER CONTINGENCIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 5,373 $ 4,629
Less: Payments made during the period (1,945) (1,345)
Add: Warranty provision for the period 2,093 1,796
Changes to warranty provision for prior periods 52 60
Balance at June 30 $ 5,573 $ 5,140