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Selected Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 222,555 | $ 190,117 | $ 197,154 | $ 186,567 | $ 204,094 | $ 184,792 | $ 193,433 | $ 181,201 | $ 796,392 | $ 763,520 | $ 719,168
Gross Profit | 123,958 | 102,547 | 104,652 | 99,885 | 106,959 | 101,209 | 102,422 | 97,740 | 431,041 | 408,330 | 381,702
Net income | 46,696 | $ 7,197 | $ 6,139 | $ (4,545) | $ 6,708 | 7,337 | $ 2,884 | (2,265) | 55,487 | 14,664 | 30,498
Legal Fees |  |  |  |  |  |  |  |  | 5,300 | 3,800 |
Income tax benefit, 2017 Tax Cuts and Jobs Act | $ 31,900 |  |  |  |  |  |  |  | 31,900 |  |
Restructuring charges |  |  |  |  |  |  |  |  | 4,250 | 9,736 | 21,671
Debt Instrument, Financing Costs Expensed |  |  |  |  |  |  |  | 2,700 |  | 2,700 |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | $ (300) | 0 | (254) | 0
Proceeds from Sale of Buildings |  |  |  |  |  | $ 5,200 |  |  |  | 5,200 |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  | $ 0 | $ 1,890 | $ 0
EPS: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.67 | $ 0.26 | $ 0.22 | $ (0.16) | $ 0.24 | $ 0.26 | $ 0.10 | $ (0.08) | $ 1.99 | $ 0.53 | $ 1.10
Diluted (in dollars per share) | $ 1.65 | $ 0.26 | $ 0.22 | $ (0.16) | $ 0.24 | $ 0.26 | $ 0.10 | $ (0.08) | $ 1.97 | $ 0.52 | $ 1.09
Selling and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Legal Fees | $ 400 | $ 300 | $ 2,500 | $ 2,000 | $ 1,000 | $ 600 | $ 1,400 | $ 800 | $ 17,480 | $ 3,773 | $ 0
Business and asset acquisition costs |  |  |  |  |  |  |  |  | 2,336 | 17,029 | 2,543
Gain (Loss) on Sale of Properties |  |  |  |  |  | 1,900 |  |  | 0 | 1,890 | 0
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 2,903 | 7,612 | 8,016
SurgiQuestInc [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 68,400 |
SurgiQuestInc [Member] | Selling and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  | 12,200 |  |  |  |  | 12,200 |  |
Business and asset acquisition costs | 1,300 | 100 | 400 | 500 | 2,500 | 2,700 | 3,600 | 8,200 |  |  |
SurgiQuestInc [Member] | Selling and Administrative Expenses [Member] | Compensatory damages [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  | 2,200 |  |  |  |  | 2,200 |  |
SurgiQuestInc [Member] | Selling and Administrative Expenses [Member] | Punitive damages [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  | 10,000 |  |  |  |  | 10,000 |  |
Administrative Restructuring [Member] | Selling and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | 1,300 | 2,600 | $ 400 | 1,000 | 2,800 | 1,347 | 6,670 | 13,655
Consolidation Costs [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 100 | $ 1,300 | $ 300 | $ 1,200 | $ 2,100 |  | 100 | $ 900 | 2,903 | 3,066 | 8,016
Termination of Product Offering [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 4,500 |  | $ 0 | $ 4,546 | $ 0

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