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Warranties (Tables)
6 Months Ended
Jun. 30, 2020
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 Three Months EndedSix Months Ended
 June 30,
2020
June 30,
2019
June 30,
2020
June 30,
2019
Warranty accrual:(in thousands)
Balance, beginning of period$12,940  $11,424  $12,652  $11,421  
Payments made(1,617) (2,071) (2,794) (3,177) 
Provisions1,837  2,313  3,302  3,422  
Balance, end of period$13,160  $11,666  $13,160  $11,666  
Warranty expense:$1,837  $2,313  $3,302  $3,422