CONSOLIDATED CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 30,420	$ 29,344
Trade accounts receivable, net	216,480	195,439
Inventories	467,996	463,517
Prepaid expenses and other current assets	45,023	43,206
Assets held for sale	2,022	1,969
TOTAL CURRENT ASSETS	761,941	733,475
OTHER ASSETS	67,432	68,251
DEFERRED TAX ASSETS	10,980	7,885
INTANGIBLE ASSETS, NET	7,680	7,211
GOODWILL	425,321	408,995
PROPERTY, PLANT AND EQUIPMENT:
Land	35,925	35,198
Buildings	323,001	317,464
Machinery and equipment	709,085	687,896
Construction in progress	35,966	40,833
Property, plant and equipment, gross	1,103,977	1,081,391
Less accumulated depreciation	(601,943)	(582,868)
Property, plant and equipment, net	502,034	498,523
TOTAL ASSETS	1,775,388	1,724,340
CURRENT LIABILITIES:
Trade accounts payable	96,136	109,780
Accrued salaries, wages and withholdings from employees	21,586	23,613
Other accrued expenses	50,230	51,764
Income taxes	15,049	11,036
Short-term borrowings	20,237	20,130
TOTAL CURRENT LIABILITIES	203,238	216,323
DEFERRED TAX LIABILITIES	17,722	18,724
OTHER LIABILITIES	13,686	13,539
ACCRUED EMPLOYEE AND RETIREE BENEFITS	22,021	19,294
LONG-TERM DEBT	691,265	604,159
SHAREHOLDERS' EQUITY:
Common stock	5,396	5,396
Additional paid-in capital	103,099	107,176
Earnings reinvested in the business	1,438,823	1,414,485
Treasury stock, at cost	(594,392)	(525,422)
Accumulated other comprehensive loss	(125,470)	(149,334)
TOTAL SHAREHOLDERS' EQUITY	827,456	852,301
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,775,388	$ 1,724,340