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Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 94,634 | $ 74,580 | $ 81,427
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 462 | 423 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 94,172 | 74,157 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 462 | 423 |
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 462 | 423 |
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 | 4,491 | 3,405 |
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 | 4,491 | 3,405 |
Non-U.S. Core [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 23,975 | 18,398 |
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 | 23,975 | 18,398 |
U.S. Large Cap Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 13,523 | 10,471 |
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 | 13,523 | 10,471 |
Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 4,559 | 3,217 |
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 | 4,559 | 3,217 |
U.S. Core Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 27,046 | 10,609 |
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 | 27,046 | 10,609 |
U.S. Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 15,255 | 23,827 |
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 | 15,255 | 23,827 |
Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,323 | 4,230 |
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 | $ 5,323 | $ 4,230 |

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