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Benefit Plans Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year $ 103,879    
Fair value of assets at end of year 109,415 $ 103,879  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 165,304 128,699  
Service cost 5,072 3,938 $ 4,594
Interest cost 6,342 6,098 5,393
Actuarial loss (7,436) 31,161  
Benefits paid (5,014) (4,592)  
Benefit obligation at end of year 164,268 165,304 128,699
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year 99,628 91,358  
Actual return on plan assets 965 6,392  
Employer contributions 9,374 6,470  
Benefits paid (5,014) (4,592)  
Fair value of assets at end of year 104,953 99,628 91,358
Funded status at end of year (59,315) (65,676)  
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 13,714 10,976  
Service cost 379 284 361
Interest cost 504 508 508
Actuarial loss 2,231 2,322  
Benefits paid (408) (376)  
Benefit obligation at end of year 16,420 13,714 10,976
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets at beginning of year 4,251 3,995  
Actual return on plan assets 79 119  
Employer contributions 468 434  
Benefits paid (336) (297)  
Fair value of assets at end of year 4,462 4,251 $ 3,995
Funded status at end of year $ (11,958) $ (9,463)