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Warranties (Tables)
3 Months Ended
Mar. 31, 2020
Guarantees [Abstract]  
Warranty
Changes in the warranty accrual are as follows:
 Three months ended
 March 31,
2020
March 31,
2019
Warranty accrual:(in thousands)
Balance, beginning of period$12,652  $11,421  
Payments made(1,177) (1,106) 
Provisions1,465  1,109  
Balance, end of period$12,940  $11,424  
Warranty expense:$1,465  $1,109