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Business Realignment and Corporate Headquarter Relocation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Apr. 25, 2016
Selling, General and Administrative Expenses [Member] | Corporate Headquarter Relocation [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Grant income | $ 338 |  | $ 338 |  |
Selling, General and Administrative Expenses [Member] | Headquarter Relocation [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Headquarter relocation costs |  | $ 272 |  | $ 272 |
Maximum [Member] | Corporate Headquarter Relocation [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Grant awarded |  |  |  |  | $ 1,400

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