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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
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