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Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), beginning balance     $ 2,915,145  
Other Comprehensive (Loss) Income, Net of Tax $ (5,202) $ 39,245 (27,611) $ 74,666
Accumulated Other Comprehensive Income (Loss), ending balance 2,975,357   2,975,357  
AOCI Including Portion Attributable to Noncontrolling Interest [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), beginning balance     535,555  
Reclassification from accumulated other comprehensive income to retained earnings as a result of adoption of new guidance     (194,889)  
Other comprehensive (loss) income before reclassifications     (21,878)  
Net amount reclassified from accumulated other comprehensive income (loss)     (5,733)  
Other Comprehensive (Loss) Income, Net of Tax     (27,611)  
Accumulated Other Comprehensive Income (Loss), ending balance 313,055   313,055  
Cumulative Foreign Currency Translation Adjustment [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), beginning balance     6,314  
Reclassification from accumulated other comprehensive income to retained earnings as a result of adoption of new guidance     0  
Other comprehensive (loss) income before reclassifications (2,844) 11,470 (22,447) 34,776
Net amount reclassified from accumulated other comprehensive income (loss)     0  
Other Comprehensive (Loss) Income, Net of Tax     (22,447)  
Accumulated Other Comprehensive Income (Loss), ending balance (16,133)   (16,133)  
Unrealized Gain on Available-for-Sale Securities [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), beginning balance     194,889  
Reclassification from accumulated other comprehensive income to retained earnings as a result of adoption of new guidance     (194,889)  
Other comprehensive (loss) income before reclassifications 0 28,702 0 42,822
Net amount reclassified from accumulated other comprehensive income (loss)     0  
Other Comprehensive (Loss) Income, Net of Tax     0  
Accumulated Other Comprehensive Income (Loss), ending balance 0   0  
Unrealized Gain on Pensions and Other Postretirement Plans [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), beginning balance     334,536  
Reclassification from accumulated other comprehensive income to retained earnings as a result of adoption of new guidance     0  
Other comprehensive (loss) income before reclassifications     0  
Net amount reclassified from accumulated other comprehensive income (loss) (2,353) (869) (5,651) (2,760)
Other Comprehensive (Loss) Income, Net of Tax (2,353) (869) (5,651) (2,760)
Accumulated Other Comprehensive Income (Loss), ending balance 328,885   328,885  
Cash Flow Hedge [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), beginning balance     (184)  
Reclassification from accumulated other comprehensive income to retained earnings as a result of adoption of new guidance     0  
Other comprehensive (loss) income before reclassifications     569  
Net amount reclassified from accumulated other comprehensive income (loss)     (82)  
Other Comprehensive (Loss) Income, Net of Tax (5) $ (58) 487 $ (172)
Accumulated Other Comprehensive Income (Loss), ending balance $ 303   $ 303