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Consolidated Statements of Shareholders' Equity (USD $) | Total USD ($) | Shares Outstanding | Common Stock USD ($) | Deferred Equity Compensation USD ($) | Accumulated Income/(Deficit) USD ($)
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 18,050,358 us-gaap_StockholdersEquity |  | $ 49,995,622 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (11,539,632)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | $ (20,405,632)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Beginning Balance, shares at Dec. 31, 2011 |  | 2,995,814 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Issuance of restricted stock grants | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  | 8,139,135 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (8,139,135)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Issuance of restricted stock grants, shares |  | 107,600 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Amortization of restricted stock grants | 4,693,926 dhil_AmortizationOfRestrictedStockGrants |  |  | 4,693,926 dhil_AmortizationOfRestrictedStockGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Issuance of stock grants | 5,540,792 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  | 5,540,792 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of stock grants, shares |  | 71,949 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Issuance of common stock related to 401k plan match | 1,057,056 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 1,057,056 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock related to 401k plan match, shares |  | 14,239 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Tax benefit from dividend payments related to restricted stock grants | 1,992,298 dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants |  | 1,992,298 dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net excess tax benefit from vested restricted stock grants | 34,543 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions |  | 34,543 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares withheld related to employee tax withholding | (1,348,262)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |  | (1,348,262)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares withheld related to employee tax withholding (shares) |  | (17,438)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Forfeiture of restricted stock grants | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures |  | (155,371)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 155,371 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Forfeiture of restricted stock grants, shares |  | (2,177)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Cash Dividend Paid of $8.00 in 2012, $3.00 in 2013 and $4.00 in 2014, per share respectively | (25,215,896)us-gaap_DividendsCommonStockCash |  |  |  | (25,215,896)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net income | 16,930,892 us-gaap_NetIncomeLoss |  |  |  | 16,930,892 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2012 | 21,735,707 us-gaap_StockholdersEquity |  | 65,255,813 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (14,829,470)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | (28,690,636)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, shares at Dec. 31, 2012 |  | 3,169,987 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Issuance of restricted stock grants | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  | 2,740,030 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2,740,030)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Issuance of restricted stock grants, shares |  | 32,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Amortization of restricted stock grants | 6,161,047 dhil_AmortizationOfRestrictedStockGrants |  |  | 6,161,047 dhil_AmortizationOfRestrictedStockGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Issuance of stock grants | 4,606,008 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  | 4,606,008 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of stock grants, shares |  | 59,006 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Issuance of common stock related to 401k plan match | 1,158,354 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 1,158,354 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock related to 401k plan match, shares |  | 12,894 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Tax benefit from dividend payments related to restricted stock grants | 357,188 dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants |  | 357,188 dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net excess tax benefit from vested restricted stock grants | 420,620 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions |  | 420,620 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares withheld related to employee tax withholding | (1,884,187)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |  | (1,884,187)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares withheld related to employee tax withholding (shares) |  | (16,500)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Forfeiture of restricted stock grants | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures |  | (10,893)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 10,893 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Forfeiture of restricted stock grants, shares |  | (140)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Cash Dividend Paid of $8.00 in 2012, $3.00 in 2013 and $4.00 in 2014, per share respectively | (9,766,575)us-gaap_DividendsCommonStockCash |  |  |  | (9,766,575)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net income | 22,154,828 us-gaap_NetIncomeLoss |  |  |  | 22,154,828 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2013 | 44,942,990 us-gaap_StockholdersEquity |  | 72,642,933 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (11,397,560)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | (16,302,383)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, shares at Dec. 31, 2013 | 3,257,247 us-gaap_CommonStockSharesOutstanding | 3,257,247 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Issuance of restricted stock grants | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  | 7,518,895 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (7,518,895)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Issuance of restricted stock grants, shares |  | 31,613 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Amortization of restricted stock grants | 5,716,035 dhil_AmortizationOfRestrictedStockGrants |  |  | 5,716,035 dhil_AmortizationOfRestrictedStockGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Issuance of stock grants | 3,984,816 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  | 3,984,816 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of stock grants, shares |  | 33,745 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Issuance of common stock related to 401k plan match | 1,356,035 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 1,356,035 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock related to 401k plan match, shares |  | 10,999 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Tax benefit from dividend payments related to restricted stock grants | 296,755 dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants |  | 296,755 dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net excess tax benefit from vested restricted stock grants | 666,889 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions |  | 666,889 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares withheld related to employee tax withholding | (976,343)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |  | (976,343)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares withheld related to employee tax withholding (shares) |  | (7,663)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Forfeiture of restricted stock grants | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures |  | (634,287)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 634,287 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
Forfeiture of restricted stock grants, shares |  | (8,213)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |
Cash Dividend Paid of $8.00 in 2012, $3.00 in 2013 and $4.00 in 2014, per share respectively | (13,248,884)us-gaap_DividendsCommonStockCash |  |  |  | (13,248,884)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net income | 31,580,931 us-gaap_NetIncomeLoss |  |  |  | 31,580,931 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2014 | $ 74,319,224 us-gaap_StockholdersEquity |  | $ 84,855,693 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (12,566,133)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember | $ 2,029,664 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, shares at Dec. 31, 2014 | 3,317,728 us-gaap_CommonStockSharesOutstanding | 3,317,728 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = dhil_SharesOutstandingMember |  |  |

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