Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 134,986	$ 172,502
Other liabilities	(12,248)	(9,605)
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	42,369	92,411
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	92,617	80,091
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. small-cap
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,751	4,692
U.S. small-cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,751	4,692
U.S. small-cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. small-cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. mid-cap
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,182	6,017
U.S. mid-cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,182	6,017
U.S. mid-cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. mid-cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. large-cap
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	21,416
U.S. large-cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	21,416
U.S. large-cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. large-cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Non-U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Non-U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Non-U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	43,829	66,922
U.S. government securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	38,436	60,286
U.S. government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	5,393	6,636
U.S. government securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,092	4,050
Non-U.S. government securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Non-U.S. government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,092	4,050
Non-U.S. government securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. governement asset and mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	7,667	2,440
U.S. governement asset and mortgage backed securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
U.S. governement asset and mortgage backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	7,667	2,440
U.S. governement asset and mortgage backed securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Corporate notes and bonds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	68,762	54,679
Corporate notes and bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Corporate notes and bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	68,762	54,679
Corporate notes and bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
State and local government securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,480	3,829
State and local government securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
State and local government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,480	3,829
State and local government securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Other investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	5,223	8,457
Other investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Other investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	5,223	8,457
Other investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0	0
Other fixed income
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	82,765	84,172
Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	7,003	8,573
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 212,506	$ 255,642	$ 274,225