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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Additional paid-in capital | Accumulated other comprehensive income (loss) | Accumulated deficit | Noncontrolling interest | Treasury stock
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2012 | $ 26,485 | $ 21 | $ 751,503 | $ 0 | $ (682,759) |  | $ (42,280)
Balance at beginning of period (in shares) at Dec. 31, 2012 |  | 21,278,606 |  |  |  |  | (1,118,222)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 3,128 | $ 1 | 3,127 |  |  |  |
Issuance of common stock under employee stock compensation plans (in shares) |  | 308,137 |  |  |  |  |
Stock-based compensation | 5,666 |  | 5,666 |  |  |  |
Retirement of treasury shares (in shares) |  | (1,118,222) |  |  |  |  | 1,118,222
Retirement of treasury shares |  | $ (1) | (42,279) |  |  |  | $ 42,280
Unrealized net loss on available-for-sale securities | 2,914 |  |  | 2,914 |  |  |
Net income | 11,420 |  |  |  | 11,420 |  |
Balance at end of period at Dec. 31, 2013 | 49,613 | $ 21 | 718,017 | 2,914 | (671,339) |  | $ 0
Balance at end of period (in shares) at Dec. 31, 2013 |  | 20,468,521 |  |  |  |  | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 4,561 |  | 4,561 |  |  |  |
Issuance of common stock under employee stock compensation plans (in shares) |  | 360,054 |  |  |  |  |
Consolidation of Viking | (778) |  |  |  |  | $ (778) |
Stock-based compensation | 11,270 |  | 11,270 |  |  |  |
Unrealized net loss on available-for-sale securities | 2,039 |  |  | 2,039 |  |  |
Repurchase of common stock | $ (67,955) | $ (1) | (67,954) |  |  |  |
Repurchase of common stock (in shares) | (1,253,425) | (1,253,425) |  |  |  |  |
Sale of warrants | $ 11,638 |  | 11,638 |  |  |  |
Purchase of convertible bond hedge | (48,143) |  | (48,143) |  |  |  |
Equity component of convertible debt issuance, net of issuance costs | 51,271 |  | 51,271 |  |  |  |
Net income | 12,024 |  |  |  | 12,024 |  |
Net loss in noncontrolling interests | (1,132) |  |  |  |  | (1,132) |
Balance at end of period at Dec. 31, 2014 | 24,408 | $ 20 | 680,660 | 4,953 | (659,315) | (1,910) | $ 0
Balance at end of period (in shares) at Dec. 31, 2014 |  | 19,575,150 |  |  |  |  | 0
Balance at beginning of period at Dec. 31, 2014 | 24,408 | $ 20 | 680,660 | 4,953 | (659,315) | (1,910) | $ 0
Balance at beginning of period (in shares) at Dec. 31, 2014 |  | 19,575,150 |  |  |  |  | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 8,849 |  | 8,849 |  |  |  |
Issuance of common stock under employee stock compensation plans (in shares) |  | 379,982 |  |  |  |  |
Stock-based compensation | 12,458 |  | 12,458 |  |  |  |
Unrealized net loss on available-for-sale securities | (50) |  |  | (50) |  |  |
Repurchase of common stock | $ (489) |  | (489) |  |  |  |
Repurchase of common stock (in shares) | (6,120) | (6,120) |  |  |  |  |
Equity component of convertible debt issuance, net of issuance costs | $ (39,628) |  | (39,628) |  |  |  |
Net income | 229,824 |  |  |  |  |  |
Net loss in noncontrolling interests | (2,380) |  |  |  |  | (2,380) |
Deconsolidation of Viking | 4,290 |  |  |  |  | $ 4,290 |
Balance at end of period at Dec. 31, 2015 | 237,282 | $ 20 | 661,850 | 4,903 | (429,491) |  | $ 0
Balance at end of period (in shares) at Dec. 31, 2015 |  | 19,949,012 |  |  |  |  | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 6,341 |  |  |  |  |  |
Net loss in noncontrolling interests | 0 |  |  |  |  |  |
Balance at end of period at Dec. 31, 2015 | $ 237,282 | $ 20 | $ 661,850 | $ 4,903 | $ (429,491) |  | $ 0
Balance at end of period (in shares) at Dec. 31, 2015 |  | 19,949,012 |  |  |  |  | 0

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