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Restructuring Charges - Components of Accrued Restructuring Costs (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 USD ($)
Restructuring Cost And Reserve [Line Items] |  |
Balance at period start | $ 3,594 | [1]
Balance at period end | 1,020 |
Employee Severance and Other Benefits [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance at period start | 3,594 |
Restructuring charges | 3,480 |
Cash payments | (6,054) |
Balance at period end | $ 1,020 |
[1] | The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

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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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