Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost (Details)

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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 58 $ 71 $ 86
Interest cost 8,493 9,331 8,915
Expected return on plan assets (13,368) (13,219) (12,788)
Amortization of net loss 3,322 3,263 3,761
Preliminary net periodic benefit cost/(income) (1,495) (554) (26)
Settlement expense 53 0 0
Net periodic benefit cost (1,442) (554) (26)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]      
Pretax (income)/loss (15,650) 218 (11,035)
Amortization of net loss (3,322) (3,263) (3,761)
Total recognized in other comprehensive income (18,972) (3,045) (14,796)
Total recognized in net periodic benefit (income)/cost and other comprehensive income (20,414) (3,599) $ (14,822)
Expected amortization of net loss in next fiscal year 3,100    
Market value of Common Stock of company included in Plan Assets $ 32,000 $ 42,100