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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Tax Disclosure [Abstract] |
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | The Company follows the provisions of the Financial Accounting Standards Codification 740 (“ASC 740”), “Accounting for Uncertainty in Income Taxes.” A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2013 |  | 2012 |  | 2011
Beginning of year | $ | 4,168,000 |  |  | $ | 2,476,000 |  |  | $ | 2,483,000 |
Additions based on tax positions related to the current year | 1,595,000 |  |  | 785,000 |  |  | 1,105,000 |
Additions for tax positions in prior years | 1,633,000 |  |  | 907,000 |  |  | 208,000 |
Reductions for tax positions in prior years | (45,000 | ) |  | — |  |  | (78,000 | )
Reductions as a result of completed audit examinations | — |  |  | — |  |  | (1,242,000 | )
End of year | $ | 7,351,000 |  |  | $ | 4,168,000 |  |  | $ | 2,476,000 |
Schedule of Components of Provision For Income Taxes | The components of the provision for income taxes are as follows:
| 2013 |  | 2012 |  | 2011
Currently payable: |  |  |  |  |
Federal | $ | 95,285,094 |  |  | $ | 76,507,760 |  |  | $ | 63,307,583 |
State | 3,259,000 |  |  | 2,450,000 |  |  | 1,663,000 |
Foreign | 1,353,000 |  |  | 1,238,000 |  |  | 850,000 |
Total | 99,897,094 |  |  | 80,195,760 |  |  | 65,820,583 |
Net deferred: |  |  |  |  |
Primarily federal | 5,237,000 |  |  | 843,000 |  |  | 13,943,000 |
Provision for income taxes | $ | 105,134,094 |  |  | $ | 81,038,760 |  |  | $ | 79,763,583 |
Schedule of Effective Income Tax Rates Different From Statutory Federal Income Tax Rates | The effective income tax rates are different from the statutory federal income tax rates for the following reasons:
| 2013 |  | 2012 |  | 2011
Statutory federal income tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes, net of federal income tax benefit | 0.6 |  |  | 0.6 |  |  | 0.1 |
Domestic production exclusion | (3.1 | ) |  | (2.9 | ) |  | (2.3 | )
Research tax credit | (0.4 | ) |  | — |  |  | — |
Other | (0.1 | ) |  | (0.2 | ) |  | (0.2 | )
Effective income tax rate | 32.0 | % |  | 32.5 | % |  | 32.6 | %
Schedule of Deferred Income Tax Assets And Liabilities | The tax effect of temporary differences which give rise to deferred income tax assets and liabilities at December 31, 2013 and 2012, are as follows:
| 2013 |  | 2012
| Current |  | Non-Current |  | Current |  | Non-Current
Assets: |  |  |  |  |  |  |
Accruals not currently deductible | $ | 2,970,671 |  |  | $ | 182,803 |  |  | $ | 3,721,183 |  |  | $ | 186,997 |
Stock based compensation | 13,290,429 |  |  | 2,202,940 |  |  | 12,044,953 |  |  | 1,696,966 |
Impairment loss on available-for-sale securities | — |  |  | 175,091 |  |  | — |  |  | 327,308 |
Intangible Assets | — |  |  | 169,913 |  |  | — |  |  | — |
Other | 4,713,241 |  |  | 40,203 |  |  | 5,690,130 |  |  | 3,609 |
Total deferred income tax assets | 20,974,341 |  |  | 2,770,950 |  |  | 21,456,266 |  |  | 2,214,880 |
Liabilities: |  |  |  |  |  |  |
Excess tax over book depreciation | — |  |  | (41,374,851 | ) |  | — |  |  | (47,704,521 | )
Patent costs | — |  |  | (1,792,968 | ) |  | — |  |  | (8,137,111 | )
Unrealized gain on investments | — |  |  | (10,482,468 | ) |  | — |  |  | (3,146,585 | )
Other | (558,249 | ) |  |  |  | (527,417 | ) |  | — |
Net deferred income taxes | $ | 20,416,092 |  |  | $ | (50,879,337 | ) |  | $ | 20,928,849 |  |  | $ | (56,773,337 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=32707879&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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