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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Transition obligation period of recognition 20 years    
Net actuarial loss and prior service costs that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year $ 1,700    
Change in plan assets [Roll Forward]      
Employer contributions $ 5,600 $ 0 $ 0
Assumptions used to determine benefit obligations [Abstract]      
Expected long-term return on plan assets 7.00% 7.00% 7.50%
Rate of compensation increase 3.00% 3.00%  
Assumptions used to determine net periodic pension cost [Abstract]      
Expected long-term return on plan assets 7.00% 7.50% 7.50%
Rate of compensation increase 3.00%    
Other changes in plan assets and benefit obligation recognized in other comprehensive income (pre-tax) [Abstract]      
Amortization of unrecognized net (loss) $ 3,154 $ (6,144) $ (19,245)
Estimate future benefit payments [Abstract]      
Ultimate health care cost trend rate 3.90%    
Effect of one-percentage point change in assumed health care cost trend rates [Abstract]      
One-percentage point increase on total service and interest cost components $ 34    
One-percentage point (decrease) on total service and interest cost components (29)    
One-percentage point increase on post-retirement accumulated benefit obligation 667    
One-percentage point (decrease) on post-retirement accumulated benefit obligation $ (576)    
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 100.00% 100.00%  
Minimum [Member]      
Assumptions used to determine benefit obligations [Abstract]      
Discount rate 4.76% 4.69% 4.19%
Rate of compensation increase     3.00%
Assumptions used to determine net periodic pension cost [Abstract]      
Discount rate 4.69% 4.19% 4.90%
Rate of compensation increase   3.00% 3.00%
Estimate future benefit payments [Abstract]      
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, minimum 6.50%    
Maximum [Member]      
Assumptions used to determine benefit obligations [Abstract]      
Discount rate 4.84% 4.71% 4.30%
Rate of compensation increase     3.75%
Assumptions used to determine net periodic pension cost [Abstract]      
Discount rate 4.71% 4.30% 5.05%
Rate of compensation increase   3.75% 3.75%
Estimate future benefit payments [Abstract]      
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, minimum 10.50%    
Pension Benefits [Member]      
Accumulated other comprehensive income (loss), before tax [Abstract]      
Net actuarial loss $ 28,328 $ 33,070  
Prior service cost (credit) 140 76  
Total amounts recognized in accumulated other comprehensive income (loss) (pre-tax) 28,468 33,146  
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 92,445 98,556  
Service cost 2,162 2,677 $ 2,290
Interest cost 4,223 3,977 4,142
Plan participants' contributions 0 0  
Actuarial (gain) (1,635) (5,225)  
Curtailments/ settlement (715) (200)  
Benefits paid (6,003) (7,340)  
Projected benefit obligation at end of year 90,477 92,445 98,556
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 107,529 117,232  
Actual return (loss) on plan assets 8,259 (3,159)  
Employer contributions 6,431 796  
Plan participants' contributions 0 0  
Benefits paid (6,003) (7,340)  
Fair value of plan assets at end of year 116,216 107,529 117,232
Funded status 25,739 15,084  
Accumulated benefit obligation 90,500 92,400  
Amounts recognized in Balance Sheet [Abstract]      
Funded status 25,739 15,084  
Components of net periodic (benefit) cost [Abstract]      
Service cost 2,162 2,677 2,290
Interest cost 4,223 3,977 4,142
Expected return on plan assets (7,430) (8,589) (8,681)
Amortization of gain due to curtailment (768) (154) 0
Amortization of prior service cost (credit) 32 21 23
Amortization of unrecognized net loss 2,235 2,174 79
Net periodic pension cost 454 106 (2,147)
Other changes in plan assets and benefit obligation recognized in other comprehensive income (pre-tax) [Abstract]      
Net (gain) loss (2,464) 6,523 17,233
Prior service cost 96 0 0
Amortization of gain due to settlement (43) (46) 0
Amortization of prior service cost (credit) (32) (21) (23)
Amortization of unrecognized net (loss) (2,235) (2,174) (79)
Total recognized in other comprehensive (income) loss (4,678) 4,282 17,131
Total recognized in net periodic benefit cost and other comprehensive income (loss) - pre-tax (4,224) 4,388 14,984
Estimate future benefit payments [Abstract]      
2017 7,876    
2018 7,169    
2019 7,042    
2020 6,884    
2021 6,725    
2022 - 2026 36,011    
Pension Benefits [Member] | Other Assets [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Assets recognized 45,344 34,965  
Pension Benefits [Member] | Other Liabilities [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Liabilities recognized $ (19,605) $ (19,881)  
Pension Benefits [Member] | Cash and Cash Equivalents [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets, range minimum 0.00%    
Target allocation percentage of assets, range maximum 20.00%    
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 2.00% 2.00%  
Pension Benefits [Member] | Fixed Income Securities [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets, range minimum 25.00%    
Target allocation percentage of assets, range maximum 55.00%    
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 46.00% 42.00%  
Pension Benefits [Member] | Equity [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets, range minimum 40.00%    
Target allocation percentage of assets, range maximum 65.00%    
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 52.00% 56.00%  
Other Benefits [Member]      
Accumulated other comprehensive income (loss), before tax [Abstract]      
Net actuarial loss $ 1,430 $ 2,333  
Prior service cost (credit) (38) (95)  
Total amounts recognized in accumulated other comprehensive income (loss) (pre-tax) 1,392 2,238  
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 8,322 8,710  
Service cost 14 17 16
Interest cost 353 374 347
Plan participants' contributions 234 263  
Actuarial (gain) (786) (333)  
Curtailments/ settlement 0 0  
Benefits paid (659) (709)  
Projected benefit obligation at end of year 7,478 8,322 8,710
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 0 0  
Actual return (loss) on plan assets 0 0  
Employer contributions 425 446  
Plan participants' contributions 234 263  
Benefits paid (659) (709)  
Fair value of plan assets at end of year 0 0 0
Funded status (7,478) (8,322)  
Accumulated benefit obligation 7,500 8,300  
Amounts recognized in Balance Sheet [Abstract]      
Funded status (7,478) (8,322)  
Components of net periodic (benefit) cost [Abstract]      
Service cost 14 17 16
Interest cost 353 374 347
Expected return on plan assets 0 0 0
Amortization of gain due to curtailment 0 0 0
Amortization of prior service cost (credit) (57) (219) (206)
Amortization of unrecognized net loss 117 263 151
Net periodic pension cost 427 435 308
Other changes in plan assets and benefit obligation recognized in other comprehensive income (pre-tax) [Abstract]      
Net (gain) loss (786) (333) 1,452
Prior service cost 0 0 0
Amortization of gain due to settlement 0 0 0
Amortization of prior service cost (credit) 57 219 206
Amortization of unrecognized net (loss) (117) (263) (151)
Total recognized in other comprehensive (income) loss (846) (377) 1,507
Total recognized in net periodic benefit cost and other comprehensive income (loss) - pre-tax (419) 58 $ 1,815
Estimate future benefit payments [Abstract]      
2017 551    
2018 572    
2019 559    
2020 572    
2021 546    
2022 - 2026 2,724    
Other Benefits [Member] | Other Assets [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Assets recognized 0 0  
Other Benefits [Member] | Other Liabilities [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Liabilities recognized $ (7,478) $ (8,322)