Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Taxes        
Effective tax rate (as a percent) 10.40% 38.10% 18.90% 33.90%
Reserve for uncertain tax positions $ 1,258   $ 763  
Voluntary pension funding     7,000  
Increased pension funding deduction     $ 651