Fresh Start Accounting - Debt Adjustments (Details) $ in Thousands	Sep. 18, 2020 USD ($)
Reorganizations [Abstract]
Fair value adjustment for Free State pipeline lease financing	$ (24,699)
Fair value adjustment for NEJD pipeline lease financing	(88)
Fair value adjustments to current and long-term maturities of debt	$ (24,787)

Fresh Start Adjustment, Fair Value Free State Pipeline Lease Financing

No definition available.

Name:	den_FreshStartAdjustmentFairValueFreeStatePipelineLeaseFinancing
Namespace Prefix:	den_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant