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Segments and Major Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Financial information of business segments        
Revenues $ 76,501 $ 72,812 $ 149,183 $ 145,726
Segment operating expenses 33,426 28,900 64,505 55,015
Segment reconciling items (31,067) (28,358) (63,376) (57,265)
Operating income (loss) 12,008 15,554 21,302 33,446
Interest and other income (expense), net (2,025) (2,888) (4,924) (5,839)
Income (Loss) before income taxes 9,983 12,666 16,378 27,607
MID Segment        
Financial information of business segments        
Revenues 54,467 54,579 108,012 109,313
Segment operating expenses 13,229 12,801 25,272 24,321
Segment Operating Income (Loss) 41,238 41,778 82,740 84,992
CRD Segment        
Financial information of business segments        
Revenues 16,407 11,778 30,508 24,604
Segment operating expenses 13,105 7,329 25,015 14,665
Segment Operating Income (Loss) 3,302 4,449 5,493 9,939
Other        
Financial information of business segments        
Revenues 5,627 6,455 10,663 11,809
Segment operating expenses 7,092 8,770 14,218 16,029
Segment Operating Income (Loss) (1,465) (2,315) (3,555) (4,220)
Operating Segments [Member]        
Financial information of business segments        
Segment Operating Income (Loss) $ 43,075 $ 43,912 $ 84,678 $ 90,711