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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 |

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