Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets		$ 336,709
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 74,051	89,982
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	180,813	228,657
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,635	18,070
U.S. Small-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	11,640	16,512
U.S. Small-Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	11,640	16,512
U.S. Mid-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	28,524	46,481
U.S. Mid-Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	10,979	17,301
U.S. Mid-Cap [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	17,545	29,180
U.S. Large-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	67,244	89,008
U.S. Large-Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	33,249	43,181
U.S. Large-Cap [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	33,995	45,827
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,785	25,905
Non-U.S. [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,785	25,905
U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,844	13,708
U.S. Government Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18,183	12,988
U.S. Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	661	720
Non-U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	766	1,599
Non-U.S. Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	766	1,599
U.S. governement asset and mortgage backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,056	830
U.S. governement asset and mortgage backed securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,056	830
Corporate fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	39,939	22,702
Corporate fixed income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	39,939	22,702
State and Local Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	5,725	8,005
State and Local Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	5,725	8,005
Other fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	57,209	83,735
Other fixed income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	57,209	83,735
Short-term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,898	6,818
Short-term Investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,898	6,818
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	19,869	21,406
Other Investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,234	3,336
Other Investments [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 18,635	$ 18,070