Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) MMBTU Boe	Dec. 31, 2020 USD ($) Boe MMBTU
Derivative [Line Items]
Derivative assets - Fair value	$ 484,184	$ 602,754
Derivative liabilities - Fair Value	$ 390,171	$ 424,828
Customer Counterparty | Crude Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	7,519	6,321
Customer Counterparty | Natural Gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	83,274	109,635
Derivative instruments not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	$ 484,184	$ 602,754
Derivative liabilities - Fair Value	389,889	422,729
Derivative instruments not designated as hedging instruments | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	222,709	82,451
Derivative liabilities - Fair Value	194,567	84,165
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	165,246	44,762
Derivative liabilities - Fair Value	$ 4,399	$ 43,978
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0
Derivative assets - Fair value	$ 87
Derivative liabilities - Fair Value	$ 0
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	2,837	2,022
Derivative assets - Fair value	$ 33,826	$ 2,344
Derivative liabilities - Fair Value	$ 106	$ 2,193
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	4,682	4,299
Derivative assets - Fair value	$ 71,242	$ 9,282
Derivative liabilities - Fair Value	$ 60	$ 14,283
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	7,519	6,321
Derivative assets - Fair value	$ 105,155	$ 11,626
Derivative liabilities - Fair Value	$ 166	$ 16,476
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU		597
Derivative assets - Fair value		$ 0
Derivative liabilities - Fair Value		$ 59
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	24,315	12,733
Derivative assets - Fair value	$ 10,903	$ 1,063
Derivative liabilities - Fair Value	$ 458	$ 205
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	58,959	96,305
Derivative assets - Fair value	$ 49,188	$ 32,073
Derivative liabilities - Fair Value	$ 3,775	$ 27,238
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	83,274	109,635
Derivative assets - Fair value	$ 60,091	$ 33,136
Derivative liabilities - Fair Value	4,233	27,502
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	57,463	37,689
Derivative liabilities - Fair Value	$ 190,168	$ 40,187
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0
Derivative assets - Fair value	$ 0
Derivative liabilities - Fair Value	$ 81
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	2,888	2,022
Derivative assets - Fair value	$ 0	$ 2,217
Derivative liabilities - Fair Value	$ 33,399	$ 2,402
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	7,517	4,299
Derivative assets - Fair value	$ 27,524	$ 8,220
Derivative liabilities - Fair Value	$ 82,723	$ 7,135
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	10,405	6,321
Derivative assets - Fair value	$ 27,524	$ 10,437
Derivative liabilities - Fair Value	$ 116,203	$ 9,537
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU		597
Derivative assets - Fair value		$ 59
Derivative liabilities - Fair Value		$ 0
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	25,929	16,293
Derivative assets - Fair value	$ 1,136	$ 205
Derivative liabilities - Fair Value	$ 10,936	$ 813
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	109,567	103,973
Derivative assets - Fair value	$ 28,803	$ 26,988
Derivative liabilities - Fair Value	$ 63,029	$ 29,837
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	135,496	120,863
Derivative assets - Fair value	$ 29,939	$ 27,252
Derivative liabilities - Fair Value	$ 73,965	$ 30,650