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Benefit Plans Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent liabilities $ 70,230 $ 74,187
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 957 883
Noncurrent liabilities 58,358 64,793
Liabilities 59,315 65,676
Other Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 86 69
Noncurrent liabilities 11,872 9,394
Liabilities $ 11,958 $ 9,463