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Segment, Product and Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues $ 770,739 $ 737,255 $ 633,021
Segment operating income (loss) 74,343 67,060 16,608
Non operating income, net 1,057 (1,174) 200
Consolidated earnings before income taxes 75,400 65,886 16,808
Significant noncash item:      
Share based compensation 1,840 1,936 4,190
Depreciation and amortization 14,309 13,299 12,795
Driver Ic [Member]
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 644,500 634,111 552,456
Segment operating income (loss) 89,162 83,883 38,401
Significant noncash item:      
Share based compensation 1,359 1,612 2,820
Depreciation and amortization 7,564 8,881 7,849
Non-driver products [Member]
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Segment revenues 126,239 103,144 80,565
Segment operating income (loss) (14,819) (16,823) (21,793)
Significant noncash item:      
Share based compensation 481 324 1,370
Depreciation and amortization $ 6,745 $ 4,418 $ 4,946