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Restructuring Costs (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |
Charges |  | $ 0 | $ 0
2017 Strategic Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Liability, beginning of period | $ 0 |  |
Charges | 1,620,000 |  |
Non-cash activity | (41,000) |  |
Liability end of period | 1,579,000 | 0 |
2017 Strategic Restructuring Plan | Employee Separation Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Liability, beginning of period | 0 |  |
Charges | 1,515,000 |  |
Non-cash activity | 7,000 |  |
Liability end of period | 1,522,000 | 0 |
2017 Strategic Restructuring Plan | Asset-Related Charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Liability, beginning of period | 0 |  |
Charges | 22,000 |  |
Non-cash activity | (22,000) |  |
Liability end of period | 0 | 0 |
2017 Strategic Restructuring Plan | Other |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Liability, beginning of period | 0 |  |
Charges | 82,000 |  |
Non-cash activity | (25,000) |  |
Liability end of period | $ 57,000 | $ 0 |

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- Definition Restructuring Reserve, Settled without Cash, Increase (Decrease) + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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