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Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Company's accrual for product warranty claims    
Balance $ 151,425 $ 34,419
Charges to expense 14,639 16,434
Settlements (8,185) (16,698)
Acquisition and other adjustments (15,309) 110,461
Balance $ 142,570 $ 144,616