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Note 8 - Product Warranty Obligations (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2017
   
2016
   
2017
   
2016
 
Balance at beginning of period
  $
32,813
    $
30,735
    $
31,695
    $
30,197
 
Product warranty reserve assumed in acquisition
   
-
     
-
     
43
     
840
 
Payments
   
(5,135)
     
(5,424)
     
(13,980)
     
(13,976)
 
Provision for warranty issued
   
6,206
     
5,762
     
14,452
     
13,464
 
Changes in estimates for pre-existing warranties
   
(705)
     
286
     
969
     
834
 
Balance at end of period
  $
33,179
    $
31,359
    $
33,179
    $
31,359
 
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2017
   
2016
   
2017
   
2016
 
Balance at beginning of period
  $
36,717
    $
29,082
    $
31,080
    $
28,961
 
Deferred revenue contracts issued
   
12,355
     
2,843
     
21,222
     
5,606
 
Amortization of deferred revenue contracts
   
(1,827
)    
(1,430
)    
(5,057
)    
(4,072
)
Balance at end of period
  $
47,245
    $
30,495
    $
47,245
    $
30,495
 
Product Warranty Obligations Included In Consolidated Balance Sheet [Table Text Block]
   
September 30,
   
December 31,
 
   
2017
   
2016
 
Product warranty liability
               
Current portion - other accrued liabilities
  $
20,445
    $
20,763
 
Long-term portion - other long-term liabilities
   
12,734
     
10,932
 
Total
  $
33,179
    $
31,695
 
                 
Deferred revenue related to extended warranties
               
Current portion - other accrued liabilities
  $
10,313
    $
6,728
 
Long-term portion - other long-term liabilities
   
36,932
     
24,352
 
Total
  $
47,245
    $
31,080