Other Comprehensive Income Details 2 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 3,419	$ 726	$ (5,758)	$ 2,560
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	684	179	(1,026)	365
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	2,735	547	(4,732)	2,195
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	6,482	4,596	13,011	9,089
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent	1,367	1,000	2,744	1,990
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	5,115	3,596	10,267	7,099
Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	543	692	1,074	940
Cross Currency Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	2,876	$ 34	(6,832)	$ 1,620
Foreign Currency Transaction Gain (Loss), Unrealized	3,300		6,100
Interest Income, Other	$ 400		$ 800