Pension and Other Postretirement Benefits - Plan Assets and Type of Fair Value Measurement (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 176,410	$ 273,937
Pension Benefits | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	0	462
Pension Benefits | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	26,540	46,670
Pension Benefits | Level 3
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
Pension Benefits | Cash | Levels 1, 2 and 3
Pension and Other Postretirement Benefits
Fair value of plan assets		462
Pension Benefits | Cash | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets		462
Pension Benefits | Cash | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets		0
Pension Benefits | Cash | Level 3
Pension and Other Postretirement Benefits
Fair value of plan assets		0
Pension Benefits | Fixed income | Levels 1, 2 and 3
Pension and Other Postretirement Benefits
Fair value of plan assets	26,540	46,670
Pension Benefits | Fixed income | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
Pension Benefits | Fixed income | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	26,540	46,670
Pension Benefits | Fixed income | Level 3
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
Pension Benefits | Commingled funds | Measured at net asset value
Pension and Other Postretirement Benefits
Fair value of plan assets	149,870	226,805
Postretirement Benefits
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 0	$ 0	$ 0