Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	$ 683,866	$ 683,866
Ending Balance	924,252	1,188,708
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	14,158	14,158
Unrealized gains (losses)		(7,740)
Amounts reclassified from accumulated other comprehensive income (loss)		262
Ending Balance	15,581	6,680
Derivative instruments
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(1,763)	(1,763)
Unrealized gains (losses)		223
Amounts reclassified from accumulated other comprehensive income (loss)		1,540
Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	16,103	16,103
Unrealized gains (losses)		(7,963)
Amounts reclassified from accumulated other comprehensive income (loss)		(1,460)
Ending Balance		6,680
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	$ (182)	(182)
Amounts reclassified from accumulated other comprehensive income (loss)		$ 182