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v3.10.0.1

Selected Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 242,444 | $ 202,307 | $ 212,820 | $ 202,064 | $ 222,555 | $ 190,117 | $ 197,154 | $ 186,567 | $ 859,634 | $ 796,392 | $ 763,520
Gross Profit | 132,655 | 110,627 | 116,271 | 109,557 | 123,958 | 102,547 | 104,652 | 99,885 | 469,110 | 431,041 | 408,330
Net income | $ 15,653 | $ 5,825 | $ 8,719 | $ 10,657 | 46,696 | 7,197 | 6,139 | (4,545) | 40,854 | 55,487 | 14,664
Legal Fees |  |  |  |  |  |  |  |  |  | 5,300 |
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit) |  |  |  |  | (31,900) |  |  |  |  | (31,900) |
Restructuring charges |  |  |  |  | $ 100 | $ 1,300 | $ 300 | $ 2,500 |  |  |
Impairment charges |  |  |  |  |  |  |  |  | $ 4,212 | $ 0 | $ 0
EPS: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.56 | $ 0.21 | $ 0.31 | $ 0.38 | $ 1.67 | $ 0.26 | $ 0.22 | $ (0.16) | $ 1.45 | $ 1.99 | $ 0.53
Diluted (in dollars per share) | $ 0.54 | $ 0.20 | $ 0.30 | $ 0.37 | $ 1.65 | $ 0.26 | $ 0.22 | $ (0.16) | $ 1.41 | $ 1.97 | $ 0.52
Selling and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Legal Fees |  |  |  |  | $ 400 | $ 300 | $ 2,500 | $ 14,200 | $ 0 | $ 17,480 | $ 3,773
Business and asset acquisition costs | $ 1,300 | $ 1,100 |  |  | $ 1,300 | $ 100 | $ 400 | $ 500 | 2,372 | 2,336 | 17,029
Research and Development Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | $ 4,200 |  |  |  |  |  |  | 4,212 | 0 | 0
Administrative Restructuring [Member] | Selling and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 0 | $ 1,347 | $ 6,670

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