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Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 81,427 | $ 73,168 | $ 71,174
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 374 | 340 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 81,053 | 72,828 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 374 | 340 |
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 374 | 340 |
Cash [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
U.S. Large Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 13,306 |
U.S. Large Cap Growth [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
U.S. Large Cap Growth [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 13,306 |
U.S. Small/Mid Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 4,111 | 5,655 |
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 | 4,111 | 5,655 |
Non-U.S. Core [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 21,065 | 10,558 |
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 | 21,065 | 10,558 |
U.S. Large Cap Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 11,717 | 7,364 |
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 | 11,717 | 7,364 |
Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 4,052 | 652 |
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 | 4,052 | 652 |
U.S. Core Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 11,284 | 24,438 |
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 | 11,284 | 24,438 |
U.S. Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 24,345 | 9,571 |
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 | 24,345 | 9,571 |
Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 4,479 | 1,254 |
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 | $ 4,479 | $ 1,254 |

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