Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized in consolidated balance sheets:
Long-term pension and benefits	$ 87,400	$ 145,000
Accumulated other comprehensive loss:
Accumulated other comprehensive loss	(93,900)	(155,000)
Pension Benefits
Amounts recognized in consolidated balance sheets:
Current accrued benefit cost	0	0
Long-term pension and benefits	77,900	128,900
Amounts recognized in consolidated balance sheets	77,900	128,900
Accumulated other comprehensive loss:
Net actuarial loss	(44,600)	(95,300)
Prior service credit	2,300	2,500
Accumulated other comprehensive loss	(42,300)	(92,800)
Net amount of liabilities and accumulated other comprehensive loss recognized in consolidated balance sheets	35,600	36,100
Other Postretirement Benefits
Amounts recognized in consolidated balance sheets:
Current accrued benefit cost	1,200	1,700
Long-term pension and benefits	9,500	16,100
Amounts recognized in consolidated balance sheets	10,700	17,800
Accumulated other comprehensive loss:
Net actuarial loss	(3,700)	(10,700)
Prior service credit	0	0
Accumulated other comprehensive loss	(3,700)	(10,700)
Net amount of liabilities and accumulated other comprehensive loss recognized in consolidated balance sheets	$ 7,000	$ 7,100