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Employee Benefit Plans Employee Benefit Plans 11 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Healthcare Cost Trend Rate      
Initial health care cost for employees under age of 65 (as a percent) 6.70%    
Ultimate health care cost for employees under age of 65 (as a percent) 4.70%    
Initial Health care cost for employees of age 65 and over (as a percent) 6.30%    
Ultimate health care cost for employees of age 65 and over (as a percent) 4.50%    
Effects of one-percentage-point change in assumed health care cost trend rates      
Effect on total of service and interest cost components -1 Percentage Point Increase $ 55    
Effect on total of service and interest cost components -1 Percentage Point Decrease (47)    
Effect on post-retirement benefit obligation -1 Percentage Point Increase 914    
Effect on post-retirement benefit obligation -1 Percentage Point Decrease $ (790)    
Union plan      
Employee benefit plans      
Expected long-term return on plan assets 7.00% [1] 7.00% 7.00%
Non-union plan      
Employee benefit plans      
Expected long-term return on plan assets 4.20% [1] 4.20% 4.20%
[1] *7.0% for union plan, 4.2% for non-union, net of income taxes in 2016, 2015 and 2014.