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Commitments And Contingencies Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
Changes in the Company's warranty liability, which is included in other accrued liabilities in the consolidated balance sheets, are as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Balance at the beginning of the year
$
58,520

 
$
56,706

 
$
44,888

Provision for warranty obligations made during the year
131,263

 
87,570

 
80,085

Settlements made during the year
(113,959
)
 
(85,756
)
 
(68,267
)
Balance at the end of year
$
75,824

 
$
58,520

 
$
56,706