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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 704,322 | $ 833 | $ (367,121) | $ 779,138 | $ (23,488) | $ 314,960
Beginning Balance, shares (in shares) at Dec. 31, 2014 |  | 83,288 |  |  |  |
Beginning Balance, Treasury Stock, shares (in shares) at Dec. 31, 2014 |  |  | (17,814) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (3,519) |  |  |  |  | (3,519)
Other comprehensive income (loss), net of tax | (24,414) |  |  |  |  |
Separation of SeaSpine | (167,229) |  |  |  | (1,667) | (165,562)
Other comprehensive income (loss), net of tax and SeaSpine | (22,747) |  |  |  | (22,747) |
Treasury Share purchases (in shares) |  |  | (16) |  |  |
Issuance of common stock | 219,680 | $ 80 |  | 219,600 |  |
Issuance of common stock, shares (in shares) |  | 8,006 |  |  |  |
Issuance of common stock through employee stock purchase plan | 231 |  |  | 231 |  |
Issuance of common stock through employee stock purchase plan (in shares) |  | 8 |  |  |  |
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes | 5,255 | $ 4 |  | 5,251 |  |
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares) |  | 412 |  |  |  |
Share-based compensation | 15,450 |  |  | 15,450 |  |
Ending Balance at Dec. 31, 2015 | 751,443 | $ 917 | $ (367,121) | 1,019,670 | (47,902) | 145,879
Ending Balance, shares (in shares) at Dec. 31, 2015 |  | 91,714 |  |  |  |
Ending Balance, Treasury Stock, shares (in shares) at Dec. 31, 2015 |  |  | (17,830) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 74,564 |  |  |  |  | 74,564
Other comprehensive income (loss), net of tax | (9,252) |  |  |  | (9,252) |
Treasury shares retirement | 0 | $ (178) | $ 367,121 | (366,943) |  |
Treasury shares retirement (in shares) |  | (17,830) | (17,830) |  |  |
Issuance of common stock through employee stock purchase plan | 391 | $ 1 |  | 390 |  |
Issuance of common stock through employee stock purchase plan (in shares) |  | 12 |  |  |  |
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes | 5,211 | $ 8 |  | 5,203 |  |
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares) |  | 824 |  |  |  |
Settlement of convertible notes |  | $ 29 |  | (29) |  |
Settlement of convertible notes (in shares) |  | 2,946 |  |  |  |
Exercise of convertible note hedge |  |  | $ (123,051) | 123,051 |  |
Exercise of convertible note hedge (in shares) |  |  | (2,946) |  |  |
Share-based compensation | 17,310 |  |  | 17,310 |  |
Ending Balance at Dec. 31, 2016 | $ 839,667 | $ 777 | $ (123,051) | 798,652 | (57,154) | 220,443
Ending Balance, shares (in shares) at Dec. 31, 2016 |  | 77,666 |  |  |  |
Ending Balance, Treasury Stock, shares (in shares) at Dec. 31, 2016 | (2,946) |  | (2,946) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | $ 64,743 |  |  |  |  | 64,743
Other comprehensive income (loss), net of tax | 33,347 |  |  |  | 33,347 |
Issuance of common stock | 1 | $ 1 |  |  |  |
Issuance of common stock, shares (in shares) |  | 135 |  |  |  |
Issuance of common stock through employee stock purchase plan | 509 | $ 0 |  | 509 |  |
Issuance of common stock through employee stock purchase plan (in shares) |  | 12 |  |  |  |
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes | 2,137 | $ 7 | $ 1,407 | 723 |  |
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares) |  | 653 | 19 |  |  |
Exercise of warrants (in shares) |  | 2,840 |  |  |  |
Exercise of warrants |  | $ 28 |  | (28) |  |
Share-based compensation | 21,902 |  |  | 21,902 |  |
Ending Balance at Dec. 31, 2017 | $ 962,306 | $ 813 | $ (121,644) | $ 821,758 | $ (23,807) | $ 285,186
Ending Balance, shares (in shares) at Dec. 31, 2017 |  | 81,306 |  |  |  |
Ending Balance, Treasury Stock, shares (in shares) at Dec. 31, 2017 | (2,912) |  | (2,927) |  |  |

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