Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	$ 683,866
Ending Balance	924,252
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	14,158
Unrealized gains (losses)	223
Amounts reclassified from accumulated other comprehensive income (loss)	1,200
Ending Balance	15,581
Derivative instruments
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(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
Amounts reclassified from accumulated other comprehensive income (loss)	(522)
Ending Balance	15,581
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(182)
Amounts reclassified from accumulated other comprehensive income (loss)	$ 182