Accumulated Other Comprehensive Income (Loss) (Schedule of Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss)
Interest expense	$ (7,047)	$ (4,128)
Net loss resulting from early retirement of debt	4,120
Interest and investment income	24	328
Provision for (benefit from) income taxes	(455)	(378)
Net income (loss)	271,872	(6,042)
Reclassification out of Accumulated Other Comprehensive Income | Derivative instruments
Accumulated Other Comprehensive Income (Loss)
Interest expense	(112)	(624)
Net loss resulting from early retirement of debt	(1,428)
Provision for (benefit from) income taxes	0	0
Net income (loss)	(1,540)	(624)
Reclassification out of Accumulated Other Comprehensive Income | Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
Amortization of actuarial gains (losses), net	627	(591)
Amortization of prior service credits	(105)	44
Provision for (benefit from) income taxes	0	0
Net income (loss)	522	(547)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Interest and investment income	(182)	10
Provision for (benefit from) income taxes	0	0
Net income (loss)	$ (182)	$ 10