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Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net $ 4,093 $ 4,298 $ 8,258 $ 8,645
Interest cost on projected benefit obligations 3,165 3,764 6,346 7,747
Expected return on plan assets (9,313) (10,286) (18,382) (20,725)
Recognition of prior service cost (1,169) (1,747) (3,187) (3,494)
Recognition of actuarial losses/(gains) 6,223 5,792 13,280 11,499
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 7,963 0 7,963
Net periodic pension cost/(credit) 2,999 9,784 6,315 11,635
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement       14,600
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax     0 (8,189)
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 141 145 282 262
Interest cost on projected benefit obligations 1,094 1,072 2,188 2,364
Expected return on plan assets (1,684) (1,945) (3,368) (4,044)
Recognition of prior service cost 0 0 0 0
Recognition of actuarial losses/(gains) 1,639 1,902 3,278 3,792
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 7,963 0 7,963
Net periodic pension cost/(credit) 1,190 9,137 2,380 10,337
Defined Benefit Plan, Settlement Loss after tax       (4,900)
Other Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 3,952 4,153 7,976 8,383
Interest cost on projected benefit obligations 2,053 2,673 4,122 5,345
Expected return on plan assets (7,629) (8,341) (15,014) (16,681)
Recognition of prior service cost (974) (1,278) (2,797) (2,556)
Recognition of actuarial losses/(gains) 5,058 4,563 10,950 9,053
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 0
Net periodic pension cost/(credit) 2,460 1,770 $ 5,237 3,544
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description     19400  
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 0 0 $ 0 0
Interest cost on projected benefit obligations 18 19 36 38
Expected return on plan assets 0 0 0 0
Recognition of prior service cost (195) (469) (390) (938)
Recognition of actuarial losses/(gains) (474) (673) (948) (1,346)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 0
Net periodic pension cost/(credit) $ (651) $ (1,123) $ (1,302) $ (2,246)
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description     500