SIGNIFCANT ACCOUNTING POLICIES (Notes)	6 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	NEW ACCOUNTING STANDARDS In May 2014, the Financial Accounting Standards Board (the “FASB”) issued ASU No. 2014-09 (“Topic 606”), Revenue from Contracts with Customers. Topic 606 supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, Revenue Recognition, and requires entities to measure and recognize revenue and the related cash flows it expects to be entitled for the transfer of promised goods or services to customers and requires an entity to recognize the incremental costs of obtaining a contract with a customer as an asset if the entity expects to recover those costs over time. Topic 606 became effective for reporting periods beginning after December 15, 2017. Topic 606 provides companies with two implementation methods. Companies can choose to apply the standard retrospectively to each prior reporting period presented (full retrospective application) or retrospectively with the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings of the annual reporting period that include the date of initial application (modified retrospective application). The Company chose the modified retrospective application method and has implemented Topic 606 effective January 1, 2018. The Company has determined that the January 1, 2018 cumulative effect to its revenue streams was an increase of approximately $0.2 million to deferred revenues, and the cumulative effect to its contract acquisition costs was an increase to contract acquisition cost assets of approximately $6.1 million, with a net after tax increase to retained earnings of approximately $4.5 million. The cumulative impact on contract acquisition costs was computed based on contracts in force as of December 31, 2017 using average commission rates on both new business sales to be amortized over approximately two years and the remaining sales contracts to be amortized over approximately one year. See Note 3 to the Notes to the Condensed Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, Leases. The new standard has requirements on how to account for leases by both the lessee and the lessor and adds clarification for what constitutes a lease, among other items. The updated standard became effective for fiscal years beginning after December 15, 2018 and interim periods the following year. The new standard must be applied using a modified retrospective transition. In July 2018, the FASB issued updated guidance which allows an additional transition method to adopt the new standard at the adoption date, as compared to the beginning of the earliest period presented, and recognize a cumulative-effect adjustment to the beginning balance of retained earnings in the period of adoption. DHI has implemented the new standard effective January 1, 2019, under the modified retrospective method with the available practical expedients. Adoption of this standard has resulted in a right-of-use asset of $17.2 million, net of accrued rent and lease exit costs, and related operating lease liability of $18.0 million being established on the Company's balance sheet as of January 1, 2019, with no cumulative-effect adjustments to retained earnings. Right-of-Use ("ROU") assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the obligation to make payments arising from the lease. The Company has implemented processes and tools to assist in the ongoing lease data collection and analysis, and has updated accounting policies and internal controls as a result of adopting this standard. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 changes how entities will account for credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current "incurred loss" model with an "expected loss" model that requires consideration of a broader range of information to estimate expected credit losses over the lifetime of a financial asset. ASU 2016-13 is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. The Company is evaluating the expected impact of this standard on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software: Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract. The new standard requires entities that are customers in cloud computing arrangements to defer implementation costs if they would be capitalized by the entity in software licensing arrangements under the internal-use software guidance. ASU No. 2018-15 is effective for fiscal years beginning after December 15, 2019 and interim periods within those years and early adoption is permitted. The amendments allow either a retrospective or prospective approach to all implementation costs incurred after adoption. The Company is evaluating the expected impact of this standard on its consolidated financial statements.

NEW ACCOUNTING STANDARDS

In May 2014, the Financial Accounting Standards Board (the “FASB”) issued ASU No. 2014-09 (“Topic 606”), Revenue from Contracts with Customers. Topic 606 supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, Revenue Recognition, and requires entities to measure and recognize revenue and the related cash flows it expects to be entitled for the transfer of promised goods or services to customers and requires an entity to recognize the incremental costs of obtaining a contract with a customer as an asset if the entity expects to recover those costs over time. Topic 606 became effective for reporting periods beginning after December 15, 2017. Topic 606 provides companies with two implementation methods. Companies can choose to apply the standard retrospectively to each prior reporting period presented (full retrospective application) or retrospectively with the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings of the annual reporting period that include the date of initial application (modified retrospective application). The Company chose the modified retrospective application method and has implemented Topic 606 effective January 1, 2018.

The Company has determined that the January 1, 2018 cumulative effect to its revenue streams was an increase of approximately $0.2 million to deferred revenues, and the cumulative effect to its contract acquisition costs was an increase to contract acquisition cost assets of approximately $6.1 million, with a net after tax increase to retained earnings of approximately $4.5 million. The cumulative impact on contract acquisition costs was computed based on contracts in force as of December 31, 2017 using average commission rates on both new business sales to be amortized over approximately two years and the remaining sales contracts to be amortized over approximately one year. See Note 3 to the Notes to the Condensed Consolidated Financial Statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The new standard has requirements on how to account for leases by both the lessee and the lessor and adds clarification for what constitutes a lease, among other items. The updated standard became effective for fiscal years beginning after December 15, 2018 and interim periods the following year. The new standard must be applied using a modified retrospective transition. In July 2018, the FASB issued updated guidance which allows an additional transition method to adopt the new standard at the adoption date, as compared to the beginning of the earliest period presented, and recognize a cumulative-effect adjustment to the beginning balance of retained earnings in the period of adoption. DHI has implemented the new standard effective January 1, 2019, under the modified retrospective method with the available practical expedients. Adoption of this standard has resulted in a right-of-use asset of $17.2 million, net of accrued rent and lease exit costs, and related operating lease liability of $18.0 million being established on the Company's balance sheet as of January 1, 2019, with no cumulative-effect adjustments to retained earnings. Right-of-Use ("ROU") assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the obligation to make payments arising from the lease. The Company has implemented processes and tools to assist in the ongoing lease data collection and analysis, and has updated accounting policies and internal controls as a result of adopting this standard.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 changes how entities will account for credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current "incurred loss" model with an "expected loss" model that requires consideration of a broader range of information to estimate expected credit losses over the lifetime of a financial asset. ASU 2016-13 is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. The Company is evaluating the expected impact of this standard on its consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software: Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract. The new standard requires entities that are customers in cloud computing arrangements to defer implementation costs if they would be capitalized by the entity in software licensing arrangements under the internal-use software guidance. ASU No. 2018-15 is effective for fiscal years beginning after December 15, 2019 and interim periods within those years and early adoption is permitted. The amendments allow either a retrospective or prospective approach to all implementation costs incurred after adoption. The Company is evaluating the expected impact of this standard on its consolidated financial statements.