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Restructuring Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 0 | $ 0 | $ 3,576
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges | 0 | 0 | 3,576
2015 Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Company estimate of the aggregate restructuring cost |  |  | 3,000
Restructuring charges |  |  | 3,576
noncashrestructuringexpectedcost |  |  | $ 1,000
Restructuring and Related Cost, Positions Eliminated [Abstract] |  |  |
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent |  |  | 8.00%
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | 0 | (1,228) | $ 0
Restructuring charges |  |  | 3,576
Payments for Restructuring |  | (1,228) | (1,765)
Restructuring Reserve, Settled without Cash |  |  | (583)
Ending balance |  | 0 | (1,228)
2015 Plan [Member] | Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 2,993
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | 0 | (1,228) | 0
Restructuring charges |  |  | 2,993
Payments for Restructuring |  | (1,228) | (1,765)
Restructuring Reserve, Settled without Cash |  |  | 0
Ending balance |  | 0 | (1,228)
2015 Plan [Member] | Restructuring Charges [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | $ 0 | 0 | 0
Restructuring Costs and Asset Impairment Charges |  |  | 583
Payments for Restructuring |  | 0 | 0
Restructuring Reserve, Settled without Cash |  |  | (583)
Ending balance |  | $ 0 | 0
2015 Plan [Member] | MID |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 1,400
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  |  | 1,400
2015 Plan [Member] | Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 1,200
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  |  | 1,200
2015 Plan [Member] | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 900
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  |  | 900
2015 Plan [Member] | RSD |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 100
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  |  | $ 100

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: 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 2: 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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