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Proxy Contest (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) director | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) director | Jun. 30, 2017 USD ($)
Other Income and Expenses [Abstract] |  |  |  |
Number of directors nominated by shareholder | director | 5 |  | 5 |
Number of directors | director | 8 |  | 8 |
Schedule of Professional Fees by Component |  |  |  |
Proxy contest | $ | $ 7,191 | $ 0 | $ 7,598 | $ 0
Strategic review and other costs |  |  |  |
Schedule of Professional Fees by Component |  |  |  |
Proxy contest | $ | $ 7,200 |  | $ 7,600 |

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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849 + Details
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