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Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |
Amortization expense | $ 2,000 | $ 1,300 | $ 3,200 | $ 2,600 |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 236,335 | $ 191,307 | 236,335 | $ 191,307 | $ 191,371 | $ 191,307
Non Strategic |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Gross goodwill | 200,000 |  | 200,000 |  | 200,000 |
Accumulated impairments | 114,100 |  | 114,100 |  | 114,100 |
Accumulated divestiture related write-offs | 85,900 |  | 85,900 |  | 85,900 |
Goodwill | $ 0 |  | $ 0 |  | $ 0 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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