CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities
Net earnings	$ 106,785	$ 73,646	$ 113,295
Adjustments to arrive at net cash provided by operating activities:
Depreciation and amortization	47,939	51,456	52,016
Share-based compensation	1,598	6,265	8,430
Loss on assets	13,190	70,745	695
Deferred income taxes	(4,452)	(16,780)	(6,178)
Changes in operating assets and liabilities:
Trade accounts receivable	(21,721)	(10,582)	3,466
Inventories	3,041	64	(30,217)
Prepaid expenses and other assets	2,698	6,479	616
Accounts payable and other accrued expenses	(8,792)	6,745	3,606
Accrued salaries, wages and withholdings from employees	(2,851)	(365)	5,384
Income taxes	(5,520)	7,047	(100)
Other liabilities	(3,868)	(5,532)	2,540
Net cash provided by operating activities	128,047	189,188	153,553
Cash Flows from Investing Activities
Acquisition of property, plant and equipment	(79,941)	(79,398)	(104,246)
Proceeds from sale of assets	12,912	1,029	6,225
Acquisition of new business	(8,393)	0	0
Other investing activities	(372)	(780)	(208)
Net cash used in investing activities	(75,794)	(79,149)	(98,229)
Cash Flows from Financing Activities
Proceeds from additional borrowings	331,277	213,985	194,973
Debt payments	(156,662)	(128,186)	(198,686)
Purchase of treasury stock	(176,566)	(137,192)	0
Dividends paid	(48,110)	(47,893)	(45,513)
Proceeds from options exercised and other equity transactions	(73)	733	1,007
Net cash used in financing activities	(50,134)	(98,553)	(48,219)
Effect of exchange rate changes on cash and cash equivalents	(10,451)	(10,993)	(2,331)
Net (decrease) increase in cash and cash equivalents	(8,332)	493	4,774
Cash and cash equivalents at beginning of period	20,329	19,836	15,062
Cash and cash equivalents at end of period	11,997	20,329	19,836
Cash paid during the year for:
Interest	16,839	16,158	16,168
Income taxes	46,281	42,335	47,436
Capitalized interest	$ 944	$ 1,449	$ 1,875