CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net earnings	$ 126,256	$ 106,785	$ 73,646
Adjustments to arrive at net cash provided by operating activities:
Depreciation and amortization	47,019	47,939	51,456
Share-based compensation	7,709	1,598	6,265
Net loss on assets	9,755	13,190	70,745
Liquidation of foreign entity	(3,257)	0	0
Deferred income taxes	10,428	(4,452)	(16,780)
Changes in operating assets and liabilities:
Trade accounts receivable	31,144	(21,721)	(10,582)
Inventories	(20,064)	3,041	64
Prepaid expenses and other assets	(671)	2,698	6,479
Accounts payable and other accrued expenses	2,332	(8,792)	6,745
Accrued salaries, wages and withholdings from employees	3,347	(2,851)	(365)
Income taxes	5,959	(5,520)	7,047
Other liabilities	2,521	(3,868)	(5,532)
Net cash provided by operating activities	222,478	128,047	189,188
Cash Flows from Investing Activities:
Acquisition of property, plant and equipment	(81,216)	(79,941)	(79,398)
Proceeds from sale of assets	6,254	12,912	1,029
Acquisition of new business	0	(8,393)	0
Other investing activities	(241)	(372)	(780)
Net cash used in investing activities	(75,203)	(75,794)	(79,149)
Cash Flows from Financing Activities
Proceeds from additional borrowings	222,562	331,277	213,985
Debt payments	(247,092)	(156,662)	(128,186)
Purchase of treasury stock	(50,100)	(176,566)	(137,192)
Dividends paid	(49,635)	(48,110)	(47,893)
Proceeds from options exercised and other equity transactions	(3,706)	(73)	733
Net cash used in financing activities	(127,971)	(50,134)	(98,553)
Effect of exchange rate changes on cash and cash equivalents	(5,436)	(10,451)	(10,993)
Net (decrease) increase in cash and cash equivalents	13,868	(8,332)	493
Cash and cash equivalents at beginning of year	11,997	20,329	19,836
Cash and cash equivalents at end of year	25,865	11,997	20,329
Cash paid during the year for:
Interest	18,474	16,839	16,158
Income taxes	29,217	46,281	42,335
Capitalized interest	$ 1,061	$ 944	$ 1,449