Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Senior Notes 7.00 Percent Due 2027
Liabilities:
Stated interest rate (as a percent)	7.00%	7.00%
Face value of debt instrument	$ 400,000	$ 400,000
Fair value of debt instrument	$ 388,500	$ 379,000
Senior Notes 6.875 Percent Due 2029
Liabilities:
Stated interest rate (as a percent)	6.875%	6.875%
Face value of debt instrument	$ 350,000	$ 350,000
Fair value of debt instrument	$ 323,750	$ 315,875
Forward derivative contracts
Assets:
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Derivative Asset, Current	Derivative Asset, Current
Liabilities:
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current	Derivative Liability, Current
Recurring basis | Exchange-Traded Derivatives
Assets:
Cash collateral netting	$ (31,723)	$ 28,542
Recurring basis | Total estimated fair value
Assets:
Pension plans	19,114	18,257
Total assets	53,193	61,536
Recurring basis | Total estimated fair value | Forward derivative contracts
Assets:
Derivative assets	8,635	19,848
Liabilities:
Derivative liabilities	(35,675)	(17,680)
Recurring basis | Total estimated fair value | Exchange-Traded Derivatives
Assets:
Exchange-traded/cleared derivative instruments	25,444	23,431
Recurring basis | Total estimated fair value | Level 1
Assets:
Pension plans	19,114	18,257
Total assets	76,281	13,146
Recurring basis | Total estimated fair value | Level 1 | Exchange-Traded Derivatives
Assets:
Exchange-traded/cleared derivative instruments	57,167	(5,111)
Recurring basis | Total estimated fair value | Level 2
Assets:
Total assets	8,635	19,848
Recurring basis | Total estimated fair value | Level 2 | Forward derivative contracts
Assets:
Derivative assets	8,635	19,848
Liabilities:
Derivative liabilities	$ (35,675)	$ (17,680)