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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 189,820 | $ 140 | $ 1,157 | $ 188,218 | $ 305
Beginning Balance, shares at Dec. 31, 2009 |  | 13,957,596 |  |  |
Exercise of stock options | 452 |  | 452 |  |
Exercise of stock options, shares |  | 6,667 |  |  |
Tax benefits associated with stock-based compensation arrangements | 2,808 |  | 2,808 |  |
Repurchase of common stock | (115,517) | (7) | (15,198) | (100,312) |
Repurchase of common stock, shares | (687,340) | (687,340) |  |  |
Restricted stock grants, net of forfeitures, shares |  | 39,899 |  |  |
Stock-based compensation | 11,987 |  | 11,987 |  |
Common stock dividends | (44,541) |  |  | (44,541) |
Change in net unrealized gains and losses on marketable securities, net of income tax | (265) |  |  |  | (265)
Net income | 131,260 |  |  | 131,260 |
Ending Balance at Dec. 31, 2010 | 176,004 | 133 | 1,206 | 174,625 | 40
Ending Balance, shares at Dec. 31, 2010 |  | 13,316,822 |  |  |
Tax shortfall associated with stock-based compensation arrangements | (569) |  | (569) |  |
Repurchase of common stock | (202,664) | (16) | (13,575) | (189,073) |
Repurchase of common stock, shares | (1,581,444) | (1,581,444) |  |  |
Restricted stock grants, net of forfeitures |  | 1 | (1) |  |
Restricted stock grants, net of forfeitures, shares |  | 57,078 |  |  |
Stock-based compensation | 13,234 |  | 13,234 |  |
Common stock dividends | (49,105) |  |  | (49,105) |
Change in net unrealized gains and losses on marketable securities, net of income tax | (40) |  |  |  | (40)
Change in fair value of derivative instrument, net of income tax | (611) |  |  |  | (611)
Net income | 106,044 |  |  | 106,044 |
Ending Balance at Dec. 31, 2011 | 42,293 | 118 | 295 | 42,491 | (611)
Ending Balance, shares at Dec. 31, 2011 |  | 11,792,456 |  |  |
Tax shortfall associated with stock-based compensation arrangements | (245) |  | (245) |  |
Repurchase of common stock | (25,001) | (5) | (5,214) | (19,782) |
Repurchase of common stock, shares | (484,841) | (484,841) |  |  |
Restricted stock grants, net of forfeitures |  | 1 | (1) |  |
Restricted stock grants, net of forfeitures, shares |  | 79,684 |  |  |
Stock-based compensation | 5,464 |  | 5,464 |  |
Common stock dividends | (47,328) |  |  | (47,328) |
Change in fair value of derivative instrument, net of income tax | (125) |  |  |  | (125)
Net income | 65,930 |  |  | 65,930 |
Ending Balance at Dec. 31, 2012 | $ 40,988 | $ 114 | $ 299 | $ 41,311 | $ (736)
Ending Balance, shares at Dec. 31, 2012 |  | 11,387,299 |  |  |

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- Definition Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 62 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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