Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total	$ 74,580	$ 81,427	$ 73,168
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	423	374
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	74,157	81,053
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	423	374
Cash [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	423	374
Cash [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Small/Mid Cap Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,405	4,111
U.S. Small/Mid Cap Growth [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Small/Mid Cap Growth [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,405	4,111
Non-U.S. Core [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	18,398	21,065
Non-U.S. Core [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Non-U.S. Core [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	18,398	21,065
U.S. Large Cap Passive [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,471	11,717
U.S. Large Cap Passive [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Large Cap Passive [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,471	11,717
Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,217	4,052
Emerging Markets [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Emerging Markets [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,217	4,052
U.S. Core Opportunistic [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,609	11,284
U.S. Core Opportunistic [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Core Opportunistic [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,609	11,284
U.S. Passive [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,827	24,345
U.S. Passive [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Passive [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,827	24,345
Opportunistic [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	4,230	4,479
Opportunistic [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Opportunistic [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 4,230	$ 4,479