Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Amounts Recognized in OCI (Details)

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BENEFIT PLANS - Amounts Recognized in OCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pretax Roll Forward:      
Balance, beginning of year $ (354,997) $ (347,202) $ (240,345)
Net actuarial (loss) gain:      
Amounts arising during the year 37,818 (25,520) (133,085)
Amortization included in net periodic benefit costs 2,368 19,693 19,056
Prior service cost:      
Amounts arising during the year 0 0 8,781
Amortization included in net periodic benefit costs (1,968) (1,968) (1,609)
Balance, end of year (316,779) (354,997) (347,202)
Tax Roll Forward:      
Balance, beginning of year 124,250 121,522 84,122
Net actuarial (loss) gain:      
Amounts arising during the year (13,236) 8,931 46,580
Amortization included in net periodic benefit costs (829) (6,892) (6,670)
Prior service cost:      
Amounts arising during the year 0 0 (3,073)
Amortization included in net periodic benefit costs 689 689 563
Balance, end of year 110,874 124,250 121,522
After-tax Roll Forward:      
Balance, beginning of year (230,747) (225,680) (156,223)
Net actuarial (loss) gain:      
Amounts arising during the year 24,582 (16,589) (86,505)
Amortization included in net periodic benefit costs 1,539 12,801 12,386
Prior service cost:      
Amounts arising during the year 0 0 5,708
Amortization included in net periodic benefit costs (1,279) (1,279) (1,046)
Balance, end of year $ (205,905) $ (230,747) $ (225,680)