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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined contribution plan expense recognized | $ 372 | $ 457 | $ 743 | $ 887
Pension Benefits [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected total contributions for current fiscal year | 0 |  | 0 |
Employer contributions | 0 | 0 | 0 | 0
Postretirement Benefit Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer contributions | 158 | $ 126 | 276 | $ 351
Postretirement Benefit Plan [Member] | Salaried Retirees [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected total contributions for current fiscal year | $ 552 |  | $ 552 |

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