Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Expense related to interest rate swaps included in Income before taxes	$ 16,332	$ 19,650	$ 20,242
Income tax effect	(41,831)	(44,829)	(32,228)
Net loss attributable to the Company	98,589	132,398	82,891
Pension settlements and curtailments	411	450	1,494
Prior service credit	(4,474)	(4,420)	(4,454)
Amortization of actuarial (loss)	5,004	4,480	5,175
Total pretax amount reclassified	139,074	178,212	115,247
Reclassification out of Accumulated Other Comprehensive Income | Derivative Valuation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Expense related to interest rate swaps included in Income before taxes	3,982	(1,011)	(146)
Income tax effect	(1,028)	259	37
Net loss attributable to the Company	2,954	(752)	(109)
Reclassification out of Accumulated Other Comprehensive Income | Pension and postretirement liability adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax effect	276	87	506
Net loss attributable to the Company	665	423	1,709
Pension settlements and curtailments	411	450	1,494
Prior service credit	(4,474)	(4,420)	(4,454)
Amortization of actuarial (loss)	5,004	4,480	5,175
Total pretax amount reclassified	$ 941	$ 510	$ 2,215