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Benefit Plans Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent liabilities $ 70,177 $ 70,230
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 1,032 957
Noncurrent liabilities 59,170 58,358
Liabilities 60,202 59,315
Other Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 87 86
Noncurrent liabilities 11,008 11,872
Liabilities $ 11,095 $ 11,958