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WARRANTY OBLIGATIONS
 6 Months Ended
Jun. 30, 2021
Product Warranties Disclosures [Abstract]  
WARRANTY OBLIGATIONS WARRANTY OBLIGATIONS
The Company’s warranty activities were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2021202020212020
(In thousands)
Warranty obligations, beginning of period$54,553 $37,501 $45,913 $37,098 
Accruals for warranties issued during period3,319 766 7,213 2,290 
Changes in estimates4,269 1,748 11,924 3,425 
Settlements(2,757)(2,578)(5,687)(5,848)
Increase due to accretion expense1,104 804 2,047 1,578 
Other(550)(334)(1,472)(636)
Warranty obligations, end of period59,938 37,907 59,938 37,907 
Less: current portion(15,009)(10,170)(15,009)(10,170)
Noncurrent$44,929 $27,737 $44,929 $27,737 
Changes in Estimates
In the three months ended June 30, 2021, the Company recorded $4.3 million in warranty expense from change in estimates, of which $2.9 million relates to the timing of cost reduction assumptions for replacement products and $1.4 million for continuing analysis of field performance data and diagnostic root-cause failure analysis primarily relating to its prior generation products. In the three months ended June 30, 2020, the Company recorded $1.7 million in warranty expense primarily related to continuing analysis of field performance data and diagnostic root-cause failure analysis primarily relating to its prior generation products.
In the six months ended June 30, 2021, the Company recorded $11.9 million in warranty expense from change in estimates, of which $7.7 million relates to continuing analysis of field performance data and diagnostic root-cause failure analysis primarily relating to its prior generation products, $2.9 million relates to the timing of cost reduction assumptions for replacement products and $1.3 million relates to the other cost assumption changes. In the six months ended June 30, 2020, the Company recorded $3.4 million in warranty expense primarily related to continuing analysis of field performance data and diagnostic root-cause failure analysis primarily relating to its prior generation products.