Nature of Operations Nature of Operations (Details) - Subsequent Event [Member] $ / shares in Units, $ in Millions	Oct. 28, 2018 USD ($) $ / shares shares
Subsequent Event [Line Items]
Merger Value | $	$ 1,700
Denbury Shares | shares	12.4
Penn Virginia Share Price | $ / shares	$ 25.86
Denbury Shares, Total Approximate Issuance | shares	191,667,000
Total Cash Payment for Penn Virginia Shares | $	$ 400
Shareholder Percentage	1500.00%