ACCRUED EXPENSES AND OTHER LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accrued Expenses
Salaries and wages	$ 108,435	$ 135,930
Deferred compensation	4,881	4,269
Pension benefits	3,842	3,863
Other postretirement benefits	1,473	1,481
Other employee benefits	17,433	28,636
Insurance obligations	139,638	130,848
Operating taxes	94,849	95,848
Income taxes	5,028	8,550
Interest	34,243	30,003
Deposits, mainly from customers	76,533	69,903
Deferred revenue	19,664	14,004
Restructuring liabilities	8,913	13,074
Other	56,845	53,194
Total	571,777	589,603
Non-Current Liabilities
Salaries and wages	0	0
Deferred compensation	59,637	58,411
Pension benefits	400,023	412,417
Other postretirement benefits	18,715	19,760
Other employee benefits	0	3,279
Insurance obligations	260,452	242,473
Operating taxes	0	0
Income taxes	22,492	23,888
Interest	0	0
Deposits, mainly from customers	3,436	3,638
Deferred revenue	0	0
Restructuring liabilities	0	0
Other	57,322	48,776
Total	822,077	812,642
Total
Salaries and wages	108,435	135,930
Deferred compensation	64,518	62,680
Pension benefits	403,865	416,280
Other postretirement benefits	20,188	21,241
Other employee benefits	17,433	31,915
Insurance obligations	400,090	373,321
Operating taxes	94,849	95,848
Income taxes	27,520	32,438
Interest	34,243	30,003
Deposits, mainly from customers	79,969	73,541
Deferred revenue	19,664	14,004
Restructuring liabilities	8,913	13,074
Other	114,167	101,970
Total	$ 1,393,854	$ 1,402,245