Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income	$ 69,246us-gaap_NetIncomeLoss	$ 67,158us-gaap_NetIncomeLoss	$ 59,379us-gaap_NetIncomeLoss
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	70,555	68,196	69,500
Amortization of debt issue costs and original issue discount	1,315	1,305	3,177
Pension expense, net of unfunded benefits paid	5,173	12,787	10,427
Charge for impairment of intangible asset	3,262us-gaap_AssetImpairmentCharges
Deferred income tax benefit	(9,419)us-gaap_DeferredIncomeTaxExpenseBenefit	(11,485)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,209)us-gaap_DeferredIncomeTaxExpenseBenefit
Gains on dispositions of plant, equipment and timberlands, net	(4,861)	(1,726)	(9,815)
Share-based compensation	7,859us-gaap_ShareBasedCompensation	7,337us-gaap_ShareBasedCompensation	6,520us-gaap_ShareBasedCompensation
Change in operating assets and liabilities
Accounts receivable	(5,404)	(777)	(3,379)
Inventories	(21,456)us-gaap_IncreaseDecreaseInInventories	2,704us-gaap_IncreaseDecreaseInInventories	(12,615)us-gaap_IncreaseDecreaseInInventories
Prepaid and other current assets	(3,521)	7,965	(14,952)
Accounts payable	(4,175)	24,822	6,953
Accruals and other current liabilities	(12,802)	3,140	8,406
Other	3,805	(7,791)	(8,546)
Net cash provided by operating activities	99,577	173,635	112,846
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(66,046)	(103,047)	(58,752)
Proceeds from disposals of plant, equipment and timberlands, net	5,072	1,947	10,272
Acquisition, net of cash acquired	(8,015)	(210,911)
Other	(600)	(425)	(225)
Net cash used by investing activities	(69,589)	(312,436)	(48,705)
Financing activities
Proceeds from note offerings			250,000
Repayments of note offerings			(205,131)us-gaap_RepaymentsOfLongTermDebt
Net borrowings under (repayments of) revolving credit facility	(30,720)	126,139	(27,000)
Payments of borrowing costs		(419)us-gaap_PaymentsOfDebtIssuanceCosts	(4,748)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from term loans	12,592	56,091
Repurchases of common stock	(12,180)		(5,675)
Payments of dividends	(18,696)us-gaap_PaymentsOfDividendsCommonStock	(16,965)us-gaap_PaymentsOfDividendsCommonStock	(15,608)us-gaap_PaymentsOfDividendsCommonStock
Payments related to share-based compensation awards and other	(1,877)	(1,671)	2,673
Net cash (used) provided by financing activities	(50,881)	163,175	(5,489)
Effect of exchange rate changes on cash	(2,152)	829	750
Net (decrease) increase in cash and cash equivalents	(23,045)	25,203	59,402
Cash and cash equivalents at the beginning of period	122,882	97,679	38,277
Cash and cash equivalents at the end of period	99,837	122,882	97,679
Cash paid for:
Interest, net of amounts capitalized	17,643us-gaap_InterestPaidNet	17,231us-gaap_InterestPaidNet	14,400us-gaap_InterestPaidNet
Income taxes, net	$ 24,139us-gaap_IncomeTaxesPaidNet	$ 15,588us-gaap_IncomeTaxesPaidNet	$ 44,657us-gaap_IncomeTaxesPaidNet

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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