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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 |

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