Shareholders' Equity Amounts recognized from accumulated other comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 2,413	$ 109	$ 539
Cross Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	11,531	(1,022)	2,212
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(13,944)	913	(2,751)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	2,878	(52)	310
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	11,066	(861)	2,441
Amortization of actuarial (gains) losses and plan amendments and prior service cost	18,609	15,467	18,756
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent	4,062	3,323	4,390
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	$ 14,547	$ 12,144	$ 14,366