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Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract] |  |  |  |
Amortization expense | $ 1,200 | $ 1,300 |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 191,371 | $ 191,307 | $ 191,371 | $ 191,307
Non Strategic [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross goodwill | 200,000 |  | 200,000 |
Accumulated impairments | 114,100 |  | 114,100 |
Accumulated divestiture related write-offs | 85,900 |  | 85,900 |
Goodwill | $ 0 |  | $ 0 |

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