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ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amount Reclassified from Accumulated Other Comprehensive Income        
Interest expense $ 7,712 $ 9,203 $ 15,974 $ 17,794
Total before tax (79,568) (84,358) (149,048) (144,203)
Tax benefit 14,379 25,307 32,054 41,286
Total reclassifications for the period (65,174) (59,048) (116,994) (102,911)
Amount Reclassified from Accumulated Other Comprehensive Income        
Amount Reclassified from Accumulated Other Comprehensive Income        
Total reclassifications for the period 903 847 1,789 1,687
Defined Benefit Pension Plans | Amount Reclassified from Accumulated Other Comprehensive Income        
Amount Reclassified from Accumulated Other Comprehensive Income        
Amortization of net loss 1,261 1,214 2,509 2,419
Amortization of prior service cost 98 89 192 176
Total before tax 1,359 1,303 2,701 2,595
Tax benefit (463) (462) (926) (921)
Total reclassifications for the period 896 841 1,775 1,674
Other | Treasury locks | Amount Reclassified from Accumulated Other Comprehensive Income        
Amount Reclassified from Accumulated Other Comprehensive Income        
Interest expense 11 10 21 20
Total before tax 11 10 21 20
Tax benefit (4) (4) (7) (7)
Total reclassifications for the period $ 7 $ 6 $ 14 $ 13