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BASIS OF PRESENTATION - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cost of goods sold | $ 86,976 | $ 81,829 | [1] | $ 169,359 | $ 161,441 | [1] |  |
Selling, general and administrative | 115,253 | 103,280 | [1] | 223,591 | 206,243 | [1] |  |
Income tax expense (benefit) | 2,361 | (947) | [1] | 4,130 | (2,820) | [1] |  |
Net income (loss) | 4,825 | 1,520 | [1] | 7,031 | (4,508) | [1] |  |
Earnings Per Share, Basic | $ 0.15 | $ 0.05 | [1] | $ 0.22 | $ (0.16) | [1] |  |
Earnings Per Share, Diluted | $ 0.15 | $ 0.05 | [1] | $ 0.21 | $ (0.16) | [1] |  |
Comprehensive income (loss) (See Note 11) | 4,752 | 3,397 | [1] | 7,957 | (9,115) | [1] |  |
Inventories, net | 223,632 |  |  | 223,632 |  |  | 206,919 | [1]
Deferred tax assets | 48,349 |  |  | 48,349 |  |  | 48,616 | [1]
Prepaid expenses and other current assets | 36,758 |  |  | 36,758 |  |  | 26,858 | [1]
Retained earnings | 287,987 |  |  | 287,987 |  |  | 280,956 | [1]
Increase (Decrease) in Inventories |  |  |  | (17,367) | (19,398) | [1] |  |
Increase (Decrease) in Prepaid Expense and Other Assets |  |  |  | (2,832) | (1,294) | [1] |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cost of goods sold |  | 83,068 |  |  | 163,336 |  |  |
Selling, general and administrative |  | 99,619 |  |  | 199,780 |  |  |
Income tax expense (benefit) |  | (445) |  |  | (2,150) |  |  |
Net income (loss) |  | 3,440 |  |  | (610) |  |  |
Earnings Per Share, Basic |  | $ 0.12 |  |  | $ (0.02) |  |  |
Earnings Per Share, Diluted |  | $ 0.12 |  |  | $ (0.02) |  |  |
Comprehensive income (loss) (See Note 11) |  | 5,317 |  |  | (5,217) |  |  |
Inventories, net |  |  |  |  |  |  | 213,431 |
Deferred tax assets |  |  |  |  |  |  | 46,300 |
Prepaid expenses and other current assets |  |  |  |  |  |  | 26,752 |
Retained earnings |  |  |  |  |  |  | 285,046 |
Increase (Decrease) in Inventories |  |  |  |  | (23,966) |  |  |
Increase (Decrease) in Prepaid Expense and Other Assets |  |  |  |  | (624) |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cost of goods sold |  | (1,239) |  |  | (1,895) |  |  |
Selling, general and administrative |  | 3,661 |  |  | 6,463 |  |  |
Income tax expense (benefit) |  | (502) |  |  | (670) |  |  |
Net income (loss) |  | (1,920) |  |  | (3,898) |  |  |
Comprehensive income (loss) (See Note 11) |  | (1,920) |  |  | (3,898) |  |  |
Inventories, net |  |  |  |  |  |  | (6,512) |
Deferred tax assets |  |  |  |  |  |  | 2,316 |
Prepaid expenses and other current assets |  |  |  |  |  |  | 106 |
Retained earnings |  |  |  |  |  |  | (4,090) |
Increase (Decrease) in Inventories |  |  |  |  | 4,568 |  |  |
Increase (Decrease) in Prepaid Expense and Other Assets |  |  |  |  | $ (670) |  |  |
[1] | See Note 1 of these condensed consolidated financial statements for discussion of the impact of the change in accounting for the medical device excise tax.

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