Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Other liabilities	$ (22,170)
Total fair value of plan assets	274,225	$ 212,392
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	77,022	74,051
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	156,015	119,706
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	19,241	18,635
U.S. Small-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	13,520	11,640
U.S. Small-Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	13,520	11,640
U.S. Mid-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	29,687	28,524
U.S. Mid-Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	9,422	10,979
U.S. Mid-Cap [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	20,265	17,545
U.S. Large-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	70,226	67,244
U.S. Large-Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	34,107	33,249
U.S. Large-Cap [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	36,119	33,995
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,937	18,785
Non-U.S. [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,937	18,785
U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	26,519	18,844
U.S. Government Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	19,973	18,183
U.S. Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	6,546	661
Non-U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,567	766
Non-U.S. Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,567	766
U.S. governement asset and mortgage backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,074	1,056
U.S. governement asset and mortgage backed securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,074	1,056
Corporate fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	58,191	39,939
Corporate fixed income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	58,191	39,939
State and Local Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	6,406	5,725
State and Local Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	6,406	5,725
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	26,151	19,869
Other Investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	6,910	1,234
Other Investments [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	19,241	$ 18,635
Other fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	35,519
Short-term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 8,598