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Consolidated Statements of Shareholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 1,447,454 | $ 958 | $ 658,612 | $ 787,884
Balance, Shares at Dec. 31, 2010 |  | 95,874 |  |
Net income | 217,997 |  |  | 217,997
Common stock issued under employee stock option and stock purchase plan | 31,362 | 13 | 31,349 |
Common stock issued under employee stock option and stock purchase plan, shares |  | 1,342 |  |
Issuance of restricted stock and vesting of deferred stock |  | 7 | (7) |
Issuance of restricted stock and vesting of deferred stock, shares |  | 680 |  |
Stock-based compensation expense | 27,092 |  | 27,092 |
Forfeitures of restricted stock |  |  |  |
Forfeitures of restricted stock, shares |  | (30) |  |
Excess tax benefit related to employee stock incentive plans | 7,111 |  | 7,111 |
Balance at Dec. 31, 2011 | 1,731,016 | 978 | 724,157 | 1,005,881
Balance, Shares at Dec. 31, 2011 |  | 97,866 |  |
Net income | 240,907 |  |  | 240,907
Common stock issued under employee stock option and stock purchase plan | 28,810 | 13 | 28,797 |
Common stock issued under employee stock option and stock purchase plan, shares |  | 1,320 |  |
Issuance of restricted stock and vesting of deferred stock |  | 9 | (9) |
Issuance of restricted stock and vesting of deferred stock, shares |  | 930 |  |
Stock-based compensation expense | 28,437 |  | 28,437 |
Forfeitures of restricted stock |  |  |  |
Forfeitures of restricted stock, shares |  | (78) |  |
Excess tax benefit related to employee stock incentive plans | 6,198 |  | 6,198 |
Balance at Dec. 31, 2012 | 2,035,368 | 1,000 | 787,580 | 1,246,788
Balance, Shares at Dec. 31, 2012 |  | 100,038 |  |
Net income | 280,517 |  |  | 280,517
Common stock issued under employee stock option and stock purchase plan | 28,697 | 14 | 28,683 |
Common stock issued under employee stock option and stock purchase plan, shares |  | 1,331 |  |
Issuance of restricted stock and vesting of deferred stock |  | 9 | (9) |
Issuance of restricted stock and vesting of deferred stock, shares |  | 922 |  |
Stock-based compensation expense | 31,288 |  | 31,288 |
Forfeitures of restricted stock |  |  |  |
Forfeitures of restricted stock, shares |  | (28) |  |
Repurchased common stock | (51,863) | (11) | (8,570) | (43,282)
Repurchased common stock, shares | (1,100) | (1,056) |  |
Excess tax benefit related to employee stock incentive plans | 18,981 |  | 18,981 |
Balance at Dec. 31, 2013 | $ 2,342,988 | $ 1,012 | $ 857,953 | $ 1,484,023
Balance, Shares at Dec. 31, 2013 |  | 101,207 |  |

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