Employee Benefit Plans (Change In Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost		$ 2,694	$ 2,993
Fair value of plan assets	$ 210,993	235,297	210,993	$ 247,583
Employer contributions		4,688	4,083
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	152,341	146,882	152,341
Actual return on assets		46,665	(15,183)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	935		(2,430)
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)		(1,692)	(9,661)
Defined Benefit Plan, Plan Assets, Benefits Paid		(24,533)	(23,060)
Balance at beginning of year		363,334	399,638
Pension - Interest cost		10,061	9,164
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0	341
Actuarial loss		37,243	(16,081)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(24,533)	(23,060)
Defined Benefit Plan, Other Cost (Credit)		(3,451)	0
Balance at end of year	363,334	382,179	363,334	399,638
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost		2,694	2,993	181
Defined Benefit Plan, Accumulated Benefit Obligation	363,334	382,179	363,334
Pension - Interest cost			9,164	2,158
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost		2	1	0
Fair value of plan assets	0	0	0	0
Employer contributions		432	580
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	10,276	10,193	10,276
Actual return on assets		0	(580)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)		0	0
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)		0	0
Defined Benefit Plan, Plan Assets, Benefits Paid		(432)	0
Balance at beginning of year		10,276	11,685
Pension - Interest cost		359	336	20
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0	0
Actuarial loss		(12)	(1,166)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(432)	(580)
Defined Benefit Plan, Other Cost (Credit)		0	0
Balance at end of year	$ 10,276	$ 10,193	$ 10,276	$ 11,685