Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Other liabilities		$ (8,860)
Total fair value	$ 199,248	211,802
Total
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	143,477	167,244
Total | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	23,882	39,467
Total | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	119,595	127,777
U.S. small-cap
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,287	2,319
U.S. small-cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,287	2,319
U.S. mid-cap
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,890	1,397
U.S. mid-cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,890	1,397
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	31,850	50,610
U.S. government securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,705	35,751
U.S. government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	13,145	14,859
Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,612	2,242
Non-U.S. government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,612	2,242
Corporate notes and bonds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	98,357	108,023
Corporate notes and bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	98,357	108,023
State and local government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,962	2,653
State and local government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,962	2,653
Other investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,519
Other investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,519
Other fixed income
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 55,771	$ 53,418