Quarterly report pursuant to Section 13 or 15(d)

BENEFIT PLANS (Details)

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BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Benefits        
Components of net periodic benefit expense [Abstract]        
Service cost $ 457 $ 435 $ 1,372 $ 1,305
Interest cost 7,984 8,099 23,953 24,299
Expected return on plan assets (11,044) (11,446) (33,131) (34,338)
Amortization of prior service cost 0 0 0 0
Amortization of gains (losses) 1,984 1,442 5,950 4,326
Settlements 2,825 2,500 8,475 7,500
Benefit cost 2,206 1,030 6,619 3,092
Change in Benefit Obligation [Roll Forward]        
Service cost 457 435 1,372 1,305
Interest cost 7,984 8,099 23,953 24,299
Post Retirement Benefits        
Components of net periodic benefit expense [Abstract]        
Service cost 0 0 0 0
Interest cost 142 258 425 776
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (492) (338) (1,476) (1,016)
Amortization of gains (losses) (116) (144) (348) (432)
Settlements (3,090) 0 (3,090) 0
Benefit cost (3,556) (224) (4,489) (672)
Change in Benefit Obligation [Roll Forward]        
Service cost 0 0 0 0
Interest cost $ 142 $ 258 $ 425 $ 776