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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in consolidated balance sheets      
Pensions $ 59,338 $ 60,836  
401(k) retirement plan      
Expense recognized in the 401(k) retirement plan 3,000 3,000 $ 3,000
Pension Plan      
Change in benefit obligation      
Benefit obligation at beginning of year 179,247 178,715  
Interest cost 7,347 7,802 7,724
Actuarial (gain) loss 10,121 2,127  
Benefits paid (9,679) (9,397)  
Benefit obligation at end of year 187,036 179,247 178,715
Change in plan assets      
Fair value of plan assets at beginning of year 116,725 121,682  
Actual return on plan assets 17,292 2,883  
Contributions 1,675 1,557  
Benefits paid (9,679) (9,397)  
Fair value of plan assets at end of year 126,013 116,725 121,682
Funded status at end of year (61,023) (62,522)  
Amounts recognized in consolidated balance sheets      
Other current liabilities 1,685 1,686  
Pensions 59,338 60,836  
Total 61,023 62,522  
Amounts recognized in accumulated other comprehensive income (loss)      
Total 45,418 46,977  
Accumulated benefit obligation      
Projected benefit obligation 187,036 179,247  
Accumulated benefit obligation 187,036 179,247  
Fair value of plan assets 126,013 116,725  
Net Periodic Benefit Cost (Pre-Tax)      
Interest cost 7,347 7,802 7,724
Expected return on plan assets (7,328) (8,245) (8,637)
Recognized actuarial loss 2,754 2,386 6,228
Net periodic benefit cost 2,773 1,943 5,315
Amounts Recognized in Other Comprehensive Income (Loss) (Pre-Tax)      
Net (gain) loss (2,597) 5,103 (9,408)
Net (benefit) cost recognized in net periodic benefit cost and other comprehensive (income) loss 176 $ 7,046 $ (4,093)
Estimated net loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in next fiscal year $ 2,700    
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.21% 4.49% 4.13%
Expected return on plan assets (as a percent) 6.50% 7.00% 7.00%
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 3.67% 4.21%  
Period considered for compounded returns 15 years    
Pension Plan | Scenario, previously reported      
Weighted-average assumptions used to determine benefit obligations      
Amortization period 9 years    
Pension Plan | Scenario, Adjustment      
Weighted-average assumptions used to determine benefit obligations      
Amortization period 23 years    
Restoration Pension Plan      
Accumulated benefit obligation      
Accumulated benefit obligation $ 27,600 $ 26,600