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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings (Accumulated Deficit) [Member]
--- | --- | --- | --- | --- | ---
Shareholders' Equity beginning of period at Dec. 31, 2011 | $ 1,938,615 | $ 3,826 | $ 2,986,240 | $ (1,306) | $ (1,050,145)
Shareholders' Equity, shares beginning of period at Dec. 31, 2011 |  | 382,608 |  |  |
Stock awards, net of cancellations |  | 11 | (11) |  |
Stock awards, net of cancellations, shares |  | 1,134 |  |  |
Stock repurchases | (845) | (1) | (727) |  | (117)
Stock repurchases, shares |  | (93) |  |  |
Stock-based compensation | 2,667 | 0 | 2,667 | 0 | 0
Share-based compensation, shares |  |  |  |  |
Net income (loss) | (11,666) |  |  |  | (11,666)
Other comprehensive income (loss) | 57 |  |  | 57 |
Shareholders' Equity end of period at Mar. 31, 2012 | 1,928,828 | 3,836 | 2,988,169 | (1,249) | (1,061,928)
Shareholders' Equity, shares end of period at Mar. 31, 2012 |  | 383,649 |  |  |
Shareholders' Equity beginning of period at Dec. 31, 2012 | 2,189,616 | 3,866 | 3,030,889 | (992) | (844,147)
Shareholders' Equity, shares beginning of period at Dec. 31, 2012 |  | 386,608 |  |  |
Stock options exercised | 7,537 | 7 | 7,530 | 0 | 0
Stock option exercises, shares |  | 669 |  |  |
Stock awards, net of cancellations |  | 5 | (5) |  |
Stock awards, net of cancellations, shares |  | 563 |  |  |
Stock repurchases | (6,427) | (3) | (2,587) |  | (3,837)
Stock repurchases, shares |  | (330) |  |  |
Stock-based compensation | 2,979 |  | 2,979 | 0 | 0
Share-based compensation, shares |  |  |  |  |
Net income (loss) | 81,762 |  |  |  | 81,762
Other comprehensive income (loss) | 48 |  |  | 48 |
Shareholders' Equity end of period at Mar. 31, 2013 | $ 2,275,515 | $ 3,875 | $ 3,038,806 | $ (944) | $ (766,222)
Shareholders' Equity, shares end of period at Mar. 31, 2013 |  | 387,510 |  |  |

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