Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) MMBTU Boe	Dec. 31, 2021 USD ($) MMBTU Boe
Derivative [Line Items]
Derivative assets - Fair value	$ 689,100	$ 484,184
Derivative liabilities - Fair value	$ 692,029	$ 390,171
Customer Counterparty | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	7,217	7,519
Customer Counterparty | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	83,460	83,274
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	$ 688,715	$ 484,184
Derivative liabilities - Fair value	691,539	389,889
Derivatives not designated as hedging instruments | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	484,563	222,709
Derivative liabilities - Fair value	443,358	194,567
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	387,536	165,246
Derivative liabilities - Fair value	$ 259	$ 4,399
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Derivative assets - Fair value	$ 672	$ 87
Derivative liabilities - Fair value	$ 0	$ 0
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	2,957	2,837
Derivative assets - Fair value	$ 80,352	$ 33,826
Derivative liabilities - Fair value	$ 0	$ 106
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	4,260	4,682
Derivative assets - Fair value	$ 138,209	$ 71,242
Derivative liabilities - Fair value	$ 255	$ 60
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	7,217	7,519
Derivative assets - Fair value	$ 219,233	$ 105,155
Derivative liabilities - Fair value	$ 255	$ 166
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	23,156	24,315
Derivative assets - Fair value	$ 41,807	$ 10,903
Derivative liabilities - Fair value	$ 4	$ 458
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	60,304	58,959
Derivative assets - Fair value	$ 126,496	$ 49,188
Derivative liabilities - Fair value	$ 0	$ 3,775
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	83,460	83,274
Derivative assets - Fair value	$ 168,303	$ 60,091
Derivative liabilities - Fair value	4	4,233
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	97,027	57,463
Derivative liabilities - Fair value	$ 443,099	$ 190,168
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Derivative assets - Fair value	$ 0	$ 0
Derivative liabilities - Fair value	$ 496	$ 81
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	3,006	2,888
Derivative assets - Fair value	$ 0	$ 0
Derivative liabilities - Fair value	$ 76,875	$ 33,399
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	6,757	7,517
Derivative assets - Fair value	$ 46,487	$ 27,524
Derivative liabilities - Fair value	$ 164,652	$ 82,723
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	9,763	10,405
Derivative assets - Fair value	$ 46,487	$ 27,524
Derivative liabilities - Fair value	$ 242,023	$ 116,203
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	23,396	25,929
Derivative assets - Fair value	$ 4	$ 1,136
Derivative liabilities - Fair value	$ 41,649	$ 10,936
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	100,433	109,567
Derivative assets - Fair value	$ 50,536	$ 28,803
Derivative liabilities - Fair value	$ 159,427	$ 63,029
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	123,829	135,496
Derivative assets - Fair value	$ 50,540	$ 29,939
Derivative liabilities - Fair value	$ 201,076	$ 73,965