Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - Change in Accumulated Benefit Obligation and Plan Assets (Details)

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EMPLOYEE BENEFIT PLANS - Change in Accumulated Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CHANGE IN ACCUMULATED BENEFIT OBLIGATION      
Accumulated benefit obligation at beginning of year $ 197,222 $ 200,375  
Service cost 58 71 $ 86
Interest cost 8,493 9,331  
Actuarial (gain) loss 6,762 6,079  
Benefits paid (10,225) (18,634)  
Accumulated Benefit obligation at end of year 202,310 197,222 200,375
CHANGE IN PLAN ASSETS      
Market value of plan assets at beginning of year 194,342 190,640  
Actual return on plan assets 35,788 19,080  
Employer contribution 0 3,256  
Benefits paid (10,225) (18,634)  
Fair value of plan assets at end of year 219,905 194,342 $ 190,640
Funded status $ 17,595 $ (2,880)