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Product Warranties (Notes)
 6 Months Ended
Jun. 30, 2013
Product Warranties [Abstract]  
Product Warranty Disclosure [Text Block]
Product Warranties
The Company provides product warranties with varying terms and durations for the majority of its products. The Company calculates its warranty reserve by considering historical warranty experience and specifically identified warranty issues. The Company records warranty expense in cost of sales. Product warranty claims not expected to occur within one year are recorded in the long-term portion of the warranty reserve in the condensed consolidated balance sheets. Actual experience could differ from the amounts estimated requiring adjustments to the liability in future periods. The changes in the Company’s consolidated warranty reserve are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Beginning balance
$
42,183

 
$
12,197

 
$
44,486

 
$
13,181

Warranty expense
3,077

 
2,613

 
7,096

 
3,602

Warranty usage
(6,246
)
 
(3,562
)
 
(12,568
)
 
(5,535
)
Ending balance
$
39,014

 
$
11,248

 
$
39,014

 
$
11,248

The increase between periods mainly represents the warranty reserve acquired during the AirSep acquisition in August 2012.