CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net earnings	$ 53,721	$ 63,811
Adjustments to arrive at net cash provided by operating activities:
Depreciation and amortization	25,893	24,453
Share-based compensation	1,330	2,425
Loss (Gain) on assets	3,073	(1,047)
Deferred income taxes	(222)	338
Changes in operating assets and liabilities	(13,751)	(40,863)
Net cash provided by operating activities	70,044	49,117
Cash flows from investing activities:
Acquisition of property, plant and equipment	(55,241)	(47,847)
Proceeds from sale of assets	31	1,321
Other investing activity	(132)	(124)
Net cash used in investing activities	(55,342)	(46,650)
Cash flows from financing activities:
Proceeds from additional borrowings	75,596	47,605
Debt payments	(55,127)	(23,435)
Purchase of treasury stock	0	(17,104)
Dividends paid	(22,507)	(21,548)
Proceeds from options exercised and other equity transactions	420	873
Net cash used in financing activities	(1,618)	(13,609)
Effect of exchange rate changes on cash and cash equivalents	(1,481)	342
Net increase (decrease) in cash and cash equivalents	11,603	(10,800)
Cash and cash equivalents at beginning of period	15,062	22,855
Cash and cash equivalents at end of period	$ 26,665	$ 12,055