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Consolidated Statement Of Shareholders' Equity Investment (USD $) | Total | Common Stocks [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2009 | $ 735,928,743 | $ 8,300,363 | $ 270,351,796 | $ 438,937,242 | $ 18,339,342
Beginning balance, shares at Dec. 31, 2009 |  | 138,339,385 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock and the tax benefit of stock plan transactions, shares |  | 3,952,742 |  |  |
Issuance of common stock and the tax benefit of stock plan transactions | 67,067,391 | 237,165 | 66,830,226 |  |
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 10,652,196 |  | 10,652,196 |  |
Dividends declared | (61,829,034) |  |  | (61,829,034) |
Net Income | 137,733,969 |  |  | 137,733,969 |
Other comprehensive income (loss) | 3,977,561 |  |  |  | 3,977,561
Ending balance at Dec. 31, 2010 | 893,530,826 | 8,537,528 | 347,834,218 | 514,842,177 | 22,316,903
Ending balance, shares at Dec. 31, 2010 |  | 142,292,127 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock and the tax benefit of stock plan transactions, shares |  | 1,777,436 |  |  |
Issuance of common stock and the tax benefit of stock plan transactions | 33,304,762 | 106,646 | 33,198,116 |  |
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 14,197,557 |  | 14,197,557 |  |
Dividends declared | (68,808,152) |  |  | (68,808,152) |
Net Income | 164,668,228 |  |  | 164,668,228 |
Other comprehensive income (loss) | (9,774,700) |  |  |  | (9,774,700)
Ending balance at Dec. 31, 2011 | 1,027,118,521 | 8,644,174 | 395,229,891 | 610,702,253 | 12,542,203
Ending balance, shares at Dec. 31, 2011 | 144,069,563 | 144,069,563 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock and the tax benefit of stock plan transactions, shares |  | 978,623 |  |  |
Issuance of common stock and the tax benefit of stock plan transactions | 12,208,881 | 58,717 | 12,150,164 |  |
Repurchases of common stock, shares |  | (1,971,829) |  |  |
Repurchases of common stock | (33,716,725) | (118,310) | (5,047,882) | (28,550,533) |
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 16,433,837 |  | 16,433,837 |  |
Dividends declared | (74,699,306) |  |  | (74,699,306) |
Net Income | 168,586,840 |  |  | 168,586,840 |
Other comprehensive income (loss) | 5,028,508 |  |  |  | 5,028,508
Ending balance at Dec. 31, 2012 | $ 1,120,960,556 | $ 8,584,581 | $ 418,766,010 | $ 676,039,254 | $ 17,570,711
Ending balance, shares at Dec. 31, 2012 | 143,076,357 | 143,076,357 |  |  |

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