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Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 73,168 | $ 71,174 | $ 72,972
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 340 | 283 |
U.S. Large Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 13,306 | 12,908 |
U.S. Small/Mid Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,655 | 5,418 |
Non-U.S. Core [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,558 | 10,474 |
U.S. Large Cap Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,364 | 7,153 |
Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 652 | 599 |
U.S. Core Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 24,438 | 23,881 |
U.S. Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9,571 | 9,328 |
Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,254 | 1,130 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 340 | 283 |
Fair Value, Inputs, Level 1 [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 340 | 283 |
Fair Value, Inputs, Level 1 [Member] | U.S. Large Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | U.S. Small/Mid Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Core [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | U.S. Large Cap Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | U.S. Core Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | U.S. Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 72,828 | 70,891 |
Fair Value, Inputs, Level 2 [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  |  |
Fair Value, Inputs, Level 2 [Member] | U.S. Large Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 13,306 | 12,908 |
Fair Value, Inputs, Level 2 [Member] | U.S. Small/Mid Cap Growth [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,655 | 5,418 |
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Core [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,558 | 10,474 |
Fair Value, Inputs, Level 2 [Member] | U.S. Large Cap Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,364 | 7,153 |
Fair Value, Inputs, Level 2 [Member] | Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 652 | 599 |
Fair Value, Inputs, Level 2 [Member] | U.S. Core Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 24,438 | 23,881 |
Fair Value, Inputs, Level 2 [Member] | U.S. Passive [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9,571 | 9,328 |
Fair Value, Inputs, Level 2 [Member] | Opportunistic [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 1,254 | $ 1,130 |

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