Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Projected Benefit Obligation (Details)

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BENEFIT PLANS - Projected Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits      
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of measurement year $ 851,000 $ 1,084,000  
Service cost 3,000 5,000 $ 2,000
Interest cost 30,000 30,000 32,000
Benefits Paid 27,000 20,000  
Settlements (31,000) (203,000)  
Plan Amendment 0 0  
Actuarial assumptions and gains and losses 74,000 (45,000)  
Total changes 49,000 (233,000)  
Projected benefit obligation at end of measurement year 900,000 851,000 1,084,000
Post-Retirement Benefits      
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of measurement year 14,000 15,000  
Service cost 0 0 0
Interest cost 0 0 0
Benefits Paid 2,000 1,000  
Settlements (4,000) 0  
Plan Amendment (2,000) 0  
Actuarial assumptions and gains and losses 1,000 0  
Total changes (7,000) (1,000)  
Projected benefit obligation at end of measurement year $ 7,000 $ 14,000 $ 15,000