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If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 falsefalseNet income attributable to shareholders5true0us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseAdjustments to reconcile net income attributable to shareholders to net cash provided by operating activities:6false0us-gaap_IncreaseDecreaseInInsuranceLiabilitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse123648000123648falsefalsefalsefalsefalse2truefalsefalse9464000094640falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change in the beginning and end of period all Insurance Liabilities balances; shall be classified as cash flows from operating activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseChange in policy liabilities and policyholder accounts7false0us-gaap_IncreaseDecreaseInReinsuranceRecoverableus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse10170001017falsefalsefalsefalsefalse2truefalsefalse-7428000-7428falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the amount of benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseNet change in reinsurance receivables and payables8false0us-gaap_DepreciationAmortizationAndAccretionNetus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1391200013912falsefalsefalsefalsefalse2truefalsefalse69060006906[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by (used in) operations using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseAmortization, principally the cost of business acquired and investments9false0us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCostsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-26032000-26032falsefalsefalsefalsefalse2truefalsefalse-20630000-20630[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseDeferred costs of business acquired10false0us-gaap_RealizedInvestmentGainsLossesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse19720001972falsefalsefalsefalsefalse2truefalsefalse1510600015106falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net realized gains or losses on investments during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 falsefalseNet realized losses on investments11false0dfg_NetChangeInFederalIncomeTaxAssetLiabilitydfgfalsedebitdurationThe net change during the period in the amount of cash payments due to taxing authorities for taxes that are based on the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2387500023875falsefalsefalsefalsefalse2truefalsefalse91380009138[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the period in the amount of cash payments due to taxing authorities for taxes that are based on the reporting entity's earnings. This also includes the net change during the reporting period in the account that represents the temporary difference that results from income (loss) that is recognized for accounting purposes but not for tax purposes and vice versa.No authoritative reference available.falsefalseNet change in federal income taxes12false0us-gaap_IncreaseDecreaseInOtherOperatingCapitalNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse-71177000-71177falsefalsefalsefalsefalse2truefalsefalse-32743000-32743falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor entities with classified balance sheets, the net change during the reporting period in the value of other assets or liabilities used in operating activities, that are not otherwise defined in the taxonomy. For entities with unclassified balance sheets, the net change during the reporting period in the value of all other assets or liabilities used in operating activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 truefalseOther13false0us-gaap_NetCashProvidedByUsedInOperatingActivitiesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse117439000117439falsefalsefalsefalsefalse2truefalsefalse101505000101505falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet cash provided by operating activities14true0us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseInvesting activities:15false0dfg_PurchasesOfInvestmentsAndLoansMadedfgfalsecreditdurationThis includes the cash outflow to acquire debt securities classified as available-for-sale securities, because they are not...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-826996000-826996falsefalsefalsefalsefalse2truefalsefalse-435672000-435672falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis includes the cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities, the cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities. Also cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). Also includes cash outflow from the purchase of receivables arising from the mortgage note on real estate, cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.No authoritative reference available.falsefalsePurchases of investments and loans made16false0dfg_SalesOfInvestmentsAndReceiptsFromRepaymentOfLoansdfgfalsedebitdurationThe cash inflow associated with the sale of debt securities classified as available-for-sale securities, the cash inflow...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse592455000592455falsefalsefalsefalsefalse2truefalsefalse165711000165711falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the sale of debt securities classified as available-for-sale securities, the cash inflow associated with the sale of equity securities classified as available-for-sale securities, the cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled. Also includes the cash inflow from proceeds from sale of receivables arising from the mortgage note on real estate; includes collections on mortgage notes receivable that are not classified as operating cash flows and the cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.No authoritative reference available.falsefalseSales of investments and receipts from repayment of loans17false0us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestmentsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse7197000071970falsefalsefalsefalsefalse2truefalsefalse139323000139323falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 31 falsefalseMaturities of investments18false0dfg_NetChangeInShortTermInvestmentsdfgfalsecreditdurationThe net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegatedtotal1truefalsefalse6682600066826falsefalsefalsefalsefalse2truefalsefalse-13510000-13510falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is one year or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.No authoritative reference available.truefalseNet change in short-term investments19false0us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-95745000-95745falsefalsefalsefalsefalse2truefalsefalse-144148000-144148falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet cash used by investing activities20true0us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseFinancing activities:21false0us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificatesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse9907600099076falsefalsefalsefalsefalse2truefalsefalse4033200040332falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from an insurance contract under which the policy holder make a lump sum payment or a series of payments in exchange for periodic payments to the policyholder beginning immediately or at some future date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26, 31 falsefalseDeposits to policyholder accounts22false0us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificatesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-97028000-97028falsefalsefalsefalsefalse2truefalsefalse-26138000-26138falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for an insurance contract under which the policy holder make a lump sum payment or a series of payments in exchange for periodic payments to the policyholder beginning immediately or at some future date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26, 31 falsefalseWithdrawals from policyholder accounts23false0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse250000000250000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b falsefalseProceeds from issuance of 2020 Senior Notes24false0us-gaap_RepaymentsOfLongTermLinesOfCreditus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-222000000-222000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b falsefalsePrincipal payments under bank credit facility25false0us-gaap_PaymentsOfDividendsCommonStockus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-6158000-6158falsefalsefalsefalsefalse2truefalsefalse-5524000-5524falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a falsefalseCash dividends paid on common stock26false0us-gaap_ProceedsFromPaymentsForOtherFinancingActivitiesus-gaaptruedebitdurationNo definition 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This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 truefalseOther financing activities27false0us-gaap_NetCashProvidedByUsedInFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-1475000-1475falsefalsefalsefalsefalse2truefalsefalse3896200038962falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from financing activity for the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet cash (used) provided by financing activities28false0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2021900020219falsefalsefalsefalsefalse2truefalsefalse-3681000-3681falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change between the beginning and ending balance of cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 falsefalseIncrease (decrease) in cash29false0dfg_RestrictedAndUnrestrictedCashdfgfalsedebitinstantRestricted and Unrestricted cash available for day-to-day operating needs.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse7280600072806falsefalsefalsefalsefalse2truefalsefalse6546400065464falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRestricted and Unrestricted cash available for day-to-day operating needs.No authoritative reference available.falsefalseCash at beginning of period30false0dfg_RestrictedAndUnrestrictedCashdfgfalsedebitinstantRestricted and Unrestricted cash available for day-to-day operating needs.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse9302500093025falsetruefalsefalsefalse2truefalsefalse6178300061783falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRestricted and Unrestricted cash available for day-to-day operating needs.No authoritative reference available.falsefalseCash at end of period1On January 1, 2011, the Company adopted, on a retrospective basis, guidance issued by the Financial Accounting Standards Board ("FASB") limiting the extent to which an insurer may capitalize costs incurred in the acquisition of an insurance contract. This adoption resulted in the restatement of certain financial information for 2010. See Note A to the consolidated financial statements for additional information regarding this restatement.228Consolidated Statements of Cash Flows (Unaudited) (USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue