XML 127 R99.htm IDEA: XBRL DOCUMENT v3.6.0.2
Retirement Plans (Funded Status of Retirement Income Plan and Retirement Life Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net actuarial gain (loss), Gross $ 12,079 $ (2,438) $ 54,136
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 8,500    
Benefit obligation, end of year 9,100 8,500  
Retirement Income Plan [Member]      
Defined Benefit Plan, Amortization of Gains (Losses) (6,299) (6,831) (1,776)
Net actuarial gain (loss), Gross 11,316 (1,425) 52,556
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 310,308 322,271  
Service cost 1,647 7,215 5,763
Interest cost 12,336 13,668 12,776
Actuarial losses (gains) 15,086 (24,994)  
Benefit obligation, end of year 330,588 310,308 322,271
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets, beginning of year 249,700 253,452  
Actual return on plan assets, net of expenses 21,079 (7,600)  
Contributions by the employer to funded plans 54,525 11,700  
Benefits paid fair value (8,789) (7,852)  
Fair value of assets, end of year 316,515 249,700 $ 253,452
Funded status (14,073) (60,608)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Liabilities (14,073) (60,608)  
Net pension liability, end of year (14,073) (60,608)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Net actuarial loss 85,845 80,828  
Total $ 85,845 $ 80,828  
Weighted-Average Liability Asumptions      
Discount rate 4.41% 4.69%  
Rate of compensation increase 0.00% 4.00%  
Accumulated benefit obligation $ 330,588 $ 310,307  
Retirement Life Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 6,000    
Benefit obligation, end of year $ 6,300 $ 6,000