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Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | $ 401,039 | $ 405,147 | $ 432,845
Marketing service fees |  |  |  |  |  |  |  |  | 46,542 | 36,824 | 29,726
Net sales | 117,365 | 107,857 | 113,423 | 108,936 | 118,639 | 111,510 | 108,216 | 103,606 | 447,581 | 441,971 | 462,571
Cost of sales | 24,944 | 24,384 | 27,547 | 21,378 | 27,300 | 23,126 | 22,755 | 22,346 | 98,253 | 95,527 | 97,093
Gross profit | 92,421 | 83,473 | 85,876 | 87,558 | 91,339 | 88,384 | 85,461 | 81,260 | 349,328 | 346,444 | 365,478
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 187,131 | 193,511 | 196,113
General and administrative |  |  |  |  |  |  |  |  | 53,391 | 64,481 | 73,010
Research and development |  |  |  |  |  |  |  |  | 28,577 | 22,861 | 27,958
Amortization of intangible assets |  |  |  |  |  |  |  |  | 2,298 | 2,550 | 2,413
Charges related to U.S. Government resolutions (Note 17) |  |  |  |  |  |  |  |  | 1,295 | 57,141 |
Total operating expenses | 66,808 | 64,668 | 71,578 | 69,638 | 83,165 | 67,417 | 73,102 | 116,860 | 272,692 | 340,544 | 299,494
Operating income | 25,613 | 18,805 | 14,298 | 17,920 | 8,174 | 20,967 | 12,359 | (35,600) | 76,636 | 5,900 | 65,984
Other income and (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (4,743) | (5,541) | (11,287)
Other income (expense) |  |  |  |  |  |  |  |  | (1,705) | (2,412) | 331
Total other income (expense) |  |  |  |  |  |  |  |  | (6,448) | (7,953) | (10,956)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 70,188 | (2,053) | 55,028
Income tax expense |  |  |  |  |  |  |  |  | (25,138) | (14,165) | (24,031)
Net income (loss) from continuing operations, net of tax | 16,009 | 10,574 | 9,870 | 8,597 | 7,652 | 11,300 | 6,579 | (41,749) | 45,050 | (16,218) | 30,997
Discontinued operations (Note 16) |  |  |  |  |  |  |  |  |  |  |
Gain on sale of Breg, Inc., net of tax |  |  |  |  |  |  |  |  | 1,345 |  |
Gain on sale of vascular operations, net of tax (Note 22) |  |  |  |  |  |  |  |  |  |  | 8,521
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | (2,994) | (2,705) | 5,089
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (563) | 813 | (311)
Net income (loss) from discontinued operations, net of tax | 5,152 | (5,558) | (2,616) | 810 | 235 | (1,225) | (1,184) | 282 | (2,212) | (1,892) | 13,299
Net income (loss) |  |  |  |  |  |  |  |  | 42,838 | (18,110) | 44,296
Net income (loss) per common share-basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.83 | $ 0.55 | $ 0.52 | $ 0.46 | $ 0.42 | $ 0.61 | $ 0.36 | $ (2.33) | $ 2.37 | $ (0.89) | $ 1.76
Net income (loss) from discontinued operations, net of tax | $ 0.27 | $ (0.29) | $ (0.14) | $ 0.04 | $ 0.01 | $ (0.07) | $ (0.07) | $ 0.02 | $ (0.12) | $ (0.10) | $ 0.76
Net income (loss) per common share-basic | $ 1.10 | $ 0.26 | $ 0.38 | $ 0.50 | $ 0.43 | $ 0.54 | $ 0.29 | $ (2.31) | $ 2.25 | $ (0.99) | $ 2.52
Net income (loss) per common share-diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.81 | $ 0.54 | $ 0.51 | $ 0.45 | $ 0.41 | $ 0.60 | $ 0.35 | $ (2.33) | $ 2.32 | $ (0.89) | $ 1.73
Net income (loss) from discontinued operations, net of tax | $ 0.26 | $ (0.29) | $ (0.14) | $ 0.04 | $ 0.01 | $ (0.06) | $ (0.06) | $ 0.02 | $ (0.11) | $ (0.10) | $ 0.74
Net income (loss) per common share-diluted: | $ 1.07 | $ 0.25 | $ 0.37 | $ 0.49 | $ 0.42 | $ 0.54 | $ 0.29 | $ (2.31) | $ 2.21 | $ (0.99) | $ 2.47
Weighted average number of common shares: |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | 18,977,263 | 18,219,343 | 17,601,956
Diluted |  |  |  |  |  |  |  |  | 19,390,413 | 18,219,343 | 17,913,545
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |  |  |  |
Translation adjustment |  |  |  |  |  |  |  |  | 768 | (2,279) | (1,317)
Unrealized gain (loss) on derivative instrument |  |  |  |  |  |  |  |  | 416 | (693) | (126)
Other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  | 1,184 | (2,972) | (1,443)
Income tax (expense) benefit related to components of other comprehensive income | (153) |  |  |  | 256 |  |  |  | (153) | 256 | 36
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 1,031 | (2,716) | (1,407)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 43,869 | $ (20,826) | $ 42,889

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