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Recently Adopted and New Accounting Standards Recently Adopted and New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Short-term Debt [Line Items] |  |
Other Nonrecurring Expense, Planned Permaent Facility Closure | $ 14,700 | $ 1,700
Proceeds and Excess Tax Benefit from Share-based Compensation | 2,200 |
Operating Leases, Future Minimum Payments Due | $ 75,340 |
Diluted EPS impact of adoption of ASU 2016-09 | $ 0.13 |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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