Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Net Periodic Benefit Costs (Details)

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BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits      
Components of net periodic benefit expense [Abstract]      
Service cost $ 3,000 $ 5,000 $ 2,000
Interest cost 30,000 30,000 32,000
Expected return on plan assets (55,000) (45,000) (44,000)
Amortization of prior service credit 0 0 0
Amortization of (gain) / loss 7,000 7,000 8,000
Settlements 11,000 (8,000) 12,000
Benefit costs (4,000) (11,000) 10,000
Post-Retirement Benefits      
Components of net periodic benefit expense [Abstract]      
Service cost 0 0 0
Interest cost 0 0 0
Expected return on plan assets 0 0 0
Amortization of prior service credit (2,000) (2,000) (2,000)
Amortization of (gain) / loss 0 0 0
Settlements 0 0 (3,000)
Benefit costs $ (2,000) $ (2,000) $ (5,000)