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Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Provision for Income Taxes | $ (25,031,542) |  | $ (19,913,176) |  | $ (45,354,887) |  | $ (42,355,915) |
Amounts Reclassified from Other Comprehensive Income [Member] | Unrealized gains(losses) on available-for-sale securities [Member] |  |  |  |  |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Realized gain (loss) on sale of securities | 5,030,124 | [1] | 2,741,335 | [1] | 7,852,331 | [1] | 4,235,900 | [1]
Provision for Income Taxes | (1,760,543) | [1] | (959,467) | [1] | (2,748,316) | [1] | (1,482,565) | [1]
Total reclassifications for the period | $ 3,269,581 | [1] | $ 1,781,868 | [1] | $ 5,104,015 | [1] | $ 2,753,335 | [1]
[1] | Amounts in parentheses indicate debits.

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 22 -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. + Details
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