Consolidated Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 15,487	$ 5,051
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	6,867	5,788
Basis of real estate sold	457	444
Change in deferred taxes	215	915
Employee benefit plans	2,799	846
Equity-based compensation expense	1,072	947
Gain on disposition of property, plant and equipment	(41)	(2)
Funding of qualified pension plans	0	(21,630)
Working capital changes	1,078	9,313
Net cash provided by operating activities	27,934	1,672
CASH FLOWS FROM INVESTING ACTIVITIES
Decrease in short-term investments	7,639	15,834
Proceeds from company owned life insurance (COLI) loan	0	21,751
Additions to property, plant and equipment	(2,321)	(989)
Additions to timber and timberlands	(2,311)	(2,140)
Proceeds from disposition of property, plant and equipment	50	2
Other, net	(423)	(246)
Net cash provided by investing activities	2,634	34,212
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to common stockholders	(12,552)	(12,503)
Repayment of long-term debt	(27,650)	(16,500)
Issuance of common stock	667	63
Change in book overdrafts	(2,030)	(1,152)
Employee tax withholdings on equity-based compensation	(1,685)	(1,713)
Other, net	(24)	(21)
Net cash used for financing activities	(43,274)	(31,826)
Increase (decrease) in cash	(12,706)	4,058
Cash at beginning of period	16,985	7,819
Cash at end of period	4,279	11,877
Cash paid (received) during the period for:
Interest, net of amount capitalized	1,550	1,264
Income taxes, net	$ 112	$ (59)