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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2009 | $ 922,045 | $ 954 | $ (221,887) | $ 662,865 | $ 8,408 | $ 471,705
BALANCE, shares at Dec. 31, 2009 |  | 95,399,000 |  |  |  |
BALANCE, shares at Dec. 31, 2009 |  |  | (9,614,000) |  |  |
Net income (loss) | 157,773 |  |  |  |  | 157,773
Foreign currency translation (loss) gain | (8,577) |  |  |  | (8,577) |
Unrealized (losses) gains on investments | 88 |  |  |  | 88 |
COMPREHENSIVE (LOSS) INCOME | 149,284 |  |  |  |  |
Treasury stock purchased | (154,913) |  | (154,913) |  |  |
Treasury stock purchased, shares |  |  | (5,427,000) |  |  |
Treasury stock retirement |  | (151) | 379,139 | (106,654) |  | (272,334)
Treasury stock retirement, shares |  | (15,119,000) | 15,119,000 |  |  |
Share-based compensation expense: |  |  |  |  |  |
Stock option plans | 7,419 |  |  | 7,419 |  |
Restricted stock award plans | 9,485 |  |  | 9,485 |  |
Employee stock purchase plan | 414 |  |  | 414 |  |
Common stock issued under: |  |  |  |  |  |
Stock option plans | 766 |  |  | 766 |  |
Stock option plans, shares | 51,528 | 52,000 |  |  |  |
Restricted stock award plans | (2,530) | 8 | (2,530) | (8) |  |
Restricted stock award plans, shares |  | 774,000 | (89,000) |  |  |
Employee stock purchase plan | 2,344 | 1 |  | 2,343 |  |
Employee stock purchase plan, shares | 100,000 | 114,000 |  |  |  |
Tax benefit of options exercised | 223 |  |  | 223 |  |
BALANCE at Dec. 31, 2010 | 934,537 | 812 | (191) | 576,853 | (81) | 357,144
BALANCE, shares at Dec. 31, 2010 |  | 81,220,000 |  |  |  |
BALANCE, shares at Dec. 31, 2010 |  |  | (11,000) |  |  |
Net income (loss) | 18,573 |  |  |  |  | 18,573
Foreign currency translation (loss) gain | (5,015) |  |  |  | (5,015) |
Unrealized (losses) gains on investments | (40) |  |  |  | (40) |
COMPREHENSIVE (LOSS) INCOME | 13,518 |  |  |  |  |
Treasury stock purchased | (150,445) |  | (150,445) |  |  |
Treasury stock purchased, shares |  |  | (8,056,000) |  |  |
Share-based compensation expense: |  |  |  |  |  |
Stock option plans | 5,453 |  |  | 5,453 |  |
Restricted stock award plans | 8,978 |  |  | 8,978 |  |
Employee stock purchase plan | 400 |  |  | 400 |  |
Common stock issued under: |  |  |  |  |  |
Stock option plans | 2,069 | 2 |  | 2,067 |  |
Stock option plans, shares | 141,625 | 142,000 |  |  |  |
Restricted stock award plans | (5,639) | 4 | (5,639) | (4) |  |
Restricted stock award plans, shares |  | 425,000 | (278,000) |  |  |
Employee stock purchase plan | 2,301 | 2 |  | 2,299 |  |
Employee stock purchase plan, shares | 200,000 | 180,000 |  |  |  |
Tax effect of options exercised and stock settlements | (5,081) |  |  | (5,081) |  |
BALANCE at Dec. 31, 2011 | 806,091 | 820 | (156,275) | 590,965 | (5,136) | 375,717
BALANCE, shares at Dec. 31, 2011 | 81,966,793 | 81,967,000 |  |  |  |
BALANCE, shares at Dec. 31, 2011 | (8,345,245) |  | (8,345,000) |  |  |
Net income (loss) | (142,796) |  |  |  |  | (142,796)
Foreign currency translation (loss) gain | 503 |  |  |  | 503 |
Unrealized (losses) gains on investments | (152) |  |  |  | (152) |
COMPREHENSIVE (LOSS) INCOME | (142,445) |  |  |  |  |
Treasury stock purchased | (56,431) |  | (56,431) |  |  |
Treasury stock purchased, shares | (6,100,000) |  | (6,072,000) |  |  |
Share-based compensation expense: |  |  |  |  |  |
Stock option plans | 2,907 |  |  | 2,907 |  |
Restricted stock award plans | 6,637 |  |  | 6,637 |  |
Employee stock purchase plan | 143 |  |  | 143 |  |
Common stock issued under: |  |  |  |  |  |
Stock option plans |  |  |  |  |  |
Restricted stock award plans | (1,282) | (6) | (1,282) | 6 |  |
Restricted stock award plans, shares |  | (557,000) | (130,000) |  |  |
Employee stock purchase plan | 1,599 | 2 |  | 1,597 |  |
Employee stock purchase plan, shares | 200,000 | 207,000 |  |  |  |
Tax effect of stock settlements | (5,429) |  |  | (5,429) |  |
BALANCE at Dec. 31, 2012 | $ 611,790 | $ 816 | $ (213,988) | $ 596,826 | $ (4,785) | $ 232,921
BALANCE, shares at Dec. 31, 2012 | 81,616,987 | 81,617,000 |  |  |  |
BALANCE, shares at Dec. 31, 2012 | (14,547,253) |  | (14,547,000) |  |  |

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