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Income Taxes (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |
Liability for Uncertain Tax Positions, Current | $ 102,171 | $ 65,772 |  |
Income Taxes Paid | 132,874,000 | 118,290,000 | $ 110,190,000 |
Unrecognized Tax Benefits | 583,977 | 113,032 | $ 391,000 | $ 294,000
Deferred Tax Liabilities, Property, Plant and Equipment | 8,585,000 | 10,368,000 |  |
deferred profit sharing contingent commissions | $ 9,767,000 | $ 10,335,000 |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 35.00% | 35.00% | 35.00% |
Current Federal Tax Expense (Benefit) | $ 118,490,000 | $ 109,893,000 | $ 94,007,000 |
Current State and Local Tax Expense (Benefit) | 17,625,000 | 15,482,000 | 13,438,000 |
Current Foreign Tax Expense (Benefit) | 430,000 | 109,000 | 805,000 |
Current Income Tax Expense (Benefit) | 136,545,000 | 125,484,000 | 108,250,000 |
Deferred Federal Income Tax Expense (Benefit) | 18,416,000 | 5,987,000 | 28,469,000 |
Deferred State and Local Income Tax Expense (Benefit) | 4,280,000 | 1,440,000 | 3,723,000 |
Deferred Foreign Income Tax Expense (Benefit) | 0 | (58,000) | 55,000 |
Summary of Income Tax Contingencies [Table Text Block] | 22,696,000 | 7,369,000 | 32,247,000 |
Income Tax Expense (Benefit) | $ 159,241,000 | $ 132,853,000 | $ 140,497,000 |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent | 3.90% | 3.30% | 3.50% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent | 0.30% | 0.30% | 0.30% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent | 0.30% | 0.40% | 0.30% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent | 0.10% | 0.10% | 0.20% |
Effective Income Tax Rate Reconciliation, Percent | 39.60% | 39.10% | 39.30% |
Deferred Tax Assets Operating Loss Carryforwards Current | $ 10,000 | $ 951,000 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals | 14,858,000 | 14,145,000 |  |
Deferred Tax Assets, Net, Current | 24,635,000 | 25,431,000 |  |
Net Unrealized Holding Gain on Available for Sale Securities | (9,000) | 56,000 |  |
Deferred Tax Liabilities, Goodwill and Intangible Assets | 393,251,000 | 364,938,000 |  |
Non Current Deferred Tax Liability | 401,827,000 | 375,362,000 |  |
Deferred income taxes, net | 360,949,000 | 341,497,000 |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 38,966,000 | 31,580,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards | 2,518,000 | 2,796,000 |  |
Deferred Tax Assets, Valuation Allowance | (606,000) | (511,000) |  |
Deferred Tax Assets, Net, Noncurrent | 40,878,000 | 33,865,000 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 773,000 | 0 | $ 232,000 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 0 | (21,000) | 0 |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | (302,000) | $ (257,000) | $ (135,000) |
Operating Loss Carryforwards | 184,218 |  |  |
Operating Loss Carryforwards State | $ 61,217,003 |  |  |
Operating Loss Carryforwards, Expiration Date | 2034 |  |  |

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