Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Net Periodic Benefit Costs (Details)

v3.3.1.900
BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Benefits      
Components of net periodic benefit expense [Abstract]      
Service cost $ 1,830 $ 1,740 $ 25,122
Interest cost 31,937 32,398 30,112
Expected return on plan assets (44,175) (45,783) (47,716)
Amortization of prior service cost 0 0 (2,883)
Amortization of loss 7,934 5,767 23,044
Curtailment 0 0 (34,613)
Settlements 12,645 11,200 8,116
Benefit costs 10,171 5,322 1,182
Post-Retirement Benefits      
Components of net periodic benefit expense [Abstract]      
Service cost 0 0 0
Interest cost 506 856 862
Expected return on plan assets 0 0 0
Amortization of prior service cost (1,968) (1,609) (1,353)
Amortization of loss (401) (571) (600)
Curtailment 0 0 0
Settlements (3,090) 0 0
Benefit costs $ (4,953) $ (1,324) $ (1,091)