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Employee Benefit Plans Unrecognized loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ (32,974) $ (38,449) $ (22,017)
Unrecognized gains arising in current year 1,400 (609) (931)
Ending Balance (59,063) (32,974) (38,449)
Unrecognized Pension and Postretirement Plan Income (Cost)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (14,923) (15,675) (15,961)
Ending Balance (15,089) (14,923) (15,675)
Pension Plans | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]      
Before tax      
AOCI before Tax, Attributable to Parent 28,559 30,169  
Reclass adjustment for postretirement plan gain included in net income (2,429) (2,652)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (1,783) 1,042  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Change in Tax Rate, Before Tax 0    
AOCI before Tax, Attributable to Parent 24,347 28,559 30,169
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 18,564 19,610  
Recognized component of periodic pension cost (1,892) (1,724)  
Unrecognized gains arising in current year (1,389) 678  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Change in Tax Rate, Net Of Tax 3,678    
Ending Balance 18,961 18,564 19,610
Other Postretirement Benefit Plans | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost [Member]      
Before tax      
AOCI before Tax, Attributable to Parent (4,404) (4,869)  
Reclass adjustment for postretirement plan gain included in net income 464 465  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 0    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, before Tax   0  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Change in Tax Rate, Before Tax 0    
AOCI before Tax, Attributable to Parent (3,940) (4,404) (4,869)
Other Postretirement Benefit Plans | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]      
Before tax      
AOCI before Tax, Attributable to Parent (1,159) (1,183)  
Reclass adjustment for postretirement plan gain included in net income 95 101  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (32)    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, before Tax   (77)  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Change in Tax Rate, Before Tax 0    
AOCI before Tax, Attributable to Parent (1,096) (1,159) (1,183)
Other Postretirement Benefit Plans | Unrecognized Pension and Postretirement Plan Income (Cost)      
Before tax      
AOCI before Tax, Attributable to Parent (5,563) (6,052)  
Reclass adjustment for postretirement plan gain included in net income 559 566  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (32)    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, before Tax   (77)  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Change in Tax Rate, Before Tax 0    
AOCI before Tax, Attributable to Parent (5,036) (5,563) (6,052)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (3,617) (3,935)  
Recognized component of periodic pension cost 435    
Unrecognized gains arising in current year (25)    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Prior to Curtailment, Net of Tax   368  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, Net of Tax   (50)  
Tax Cuts and Jobs Act, Measurement Period Adjustment, Change in Tax Rate, Net Of Tax (721)    
Ending Balance $ (3,928) $ (3,617) $ (3,935)