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Segment, Product and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment revenues $ 737,255 $ 633,021 $ 642,692
Segment operating income (loss) 67,060 16,608 35,358
Non operating loss, net (1,174) 200 (64)
Consolidated earnings before income taxes 65,886 16,808 35,294
Significant noncash item:      
Share based compensation 1,936 4,190 6,311
Depreciation and amortization 13,299 12,795 13,626
Driver Ic [Member]
     
Segment revenues 634,111 552,456 590,057
Segment operating income (loss) 83,883 38,401 54,815
Significant noncash item:      
Share based compensation 1,612 2,820 5,007
Depreciation and amortization 8,881 7,849 10,074
Non-driver products [Member]
     
Segment revenues 103,144 80,565 52,635
Segment operating income (loss) (16,823) (21,793) (19,457)
Significant noncash item:      
Share based compensation 324 1,370 1,304
Depreciation and amortization $ 4,418 $ 4,946 $ 3,552