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Segment information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]      
Number of independent public companies | Segment 2    
Number of business segments | Segment 1    
Long-lived assets $ 970,111 $ 1,037,484  
Research and development 108,290 119,186 $ 104,721
Interest revenue 1,053 572 320
Interest expense (7,617) (6,523) (8,240)
Depreciation and amortization 28,023 23,737 22,340
Net income 51,776 62,870 36,741
Intangible assets 33,865 40,758  
In-process research and development assets 0 701  
Goodwill, net book value 41,001 41,001  
Total assets 970,111 1,037,484  
Expenditures for long-lived assets $ 76,257 $ 44,812 $ 30,673
Revenue [Member] | United States [Member]      
Segment Reporting Information [Line Items]      
Concentration risk percentage 96.00% 98.00% 96.00%
Revenue [Member] | U.S. Government [Member]      
Segment Reporting Information [Line Items]      
Concentration risk percentage 80.00% 89.00% 87.00%
Foreign Jurisdictions [Member]      
Segment Reporting Information [Line Items]      
Long-lived assets $ 28,400 $ 25,800  
Total assets $ 28,400 $ 25,800