Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 31, 2020	Dec. 31, 2019
Assets
Pension plan assets	$ 61,936	$ 49,914
Recurring
Assets
Pension plan assets	61,936		$ 0
Liabilities
Contingent consideration	4,609		4,396
Derivative liabilities	0		679
Recurring | Level 1
Assets
Pension plan assets	0		0
Liabilities
Contingent consideration	0		0
Derivative liabilities	0		0
Recurring | Level 2
Assets
Pension plan assets	0		0
Liabilities
Contingent consideration	0		0
Derivative liabilities	0		679
Recurring | Level 3
Assets
Pension plan assets	61,936		0
Liabilities
Contingent consideration	4,609		4,396
Derivative liabilities	$ 0		$ 0