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Segments and Major Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financial information of business segments        
Revenues $ 72,812 $ 76,518 $ 145,726 $ 154,806
Segment operating expenses 28,900 25,420 55,015 49,885
Segment operating income (loss) 43,912 51,098 90,711 104,921
Segment reconciling items (28,358) (30,994) (57,265) (61,628)
Operating income (loss) 15,554 20,104 33,446 43,293
Interest and other income (expense), net (2,888) (8,666) (5,839) (18,579)
Income (Loss) before income taxes 12,666 11,438 27,607 24,714
MID Segment        
Financial information of business segments        
Revenues 54,579 58,664 109,313 119,820
Segment operating expenses 12,801 9,038 24,321 18,319
Segment operating income (loss) 41,778 49,626 84,992 101,501
CRD Segment        
Financial information of business segments        
Revenues 11,778 12,771 24,604 25,674
Segment operating expenses 7,329 7,189 14,665 13,719
Segment operating income (loss) 4,449 5,582 9,939 11,955
Other        
Financial information of business segments        
Revenues 6,455 5,083 11,809 9,312
Segment operating expenses 8,770 9,193 16,029 17,847
Segment operating income (loss) $ (2,315) $ (4,110) $ (4,220) $ (8,535)