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Schedule II-Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Schedule II—Valuation and Qualifying Accounts
 
Balance at
Beginning
of Year
 
Additions
 
Deductions
 
Balance
at End of
Year
 
(In thousands)
Allowance for doubtful accounts:
 
 
 
 
 
 
 
Year ended December 31, 2017
$
1,255

 
$
100

 
$
(98
)
 
$
1,257

Year ended December 31, 2016
1,255

 
60

 
(60
)
 
1,255

Year ended December 31, 2015
1,255

 
35

 
(35
)
 
1,255

Allowance for sales returns and warranty:
 
 
 
 
 
 
 
Year ended December 31, 2017
$
72,026

 
$
172,493

 
$
(148,506
)
 
$
96,013

Year ended December 31, 2016
72,609

 
109,494

 
(110,077
)
 
72,026

Year ended December 31, 2015
62,376

 
105,987

 
(95,754
)
 
72,609

Allowance for price protection:
 
 
 
 
 
 
 
Year ended December 31, 2017
$
4,480

 
$
7,764

 
$
(8,597
)
 
$
3,647

Year ended December 31, 2016
2,125

 
12,239

 
(9,884
)
 
4,480

Year ended December 31, 2015
1,806

 
7,467

 
(7,148
)
 
2,125