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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Cash Flows [Abstract]      
Cash and cash equivalents at beginning of year $ 49,192 $ 151,831 $ 21,761
Cash flows from operating activities      
Net income 206,907 177,125 162,283
Adjustments to reconcile net income to cash flows from operating activities:      
Noncash foreign exchange loss (gain) 114 (603) 1,812
Depreciation and other amortization 41,749 37,667 31,573
Amortization of deferred financing costs 1,603 1,467 1,247
Noncash pension benefits expense 13,719 13,911 13,578
Noncash postretirement benefits expense 2,780 2,832 2,647
Noncash environmental remediation and dismantling 1,321 3,554 4,177
Deferred income tax expense 2,375 1,933 4,257
Unrealized loss on derivative instruments-net 12,642 8,016 11,440
Stock award 2,900 2,790 0
Gain on legal settlement, net (38,656) [1] 0 [1] 0 [1]
Change in assets and liabilities:      
Trade and other accounts receivable, net (16,225) (34,815) (66)
Inventories (33,154) (74,852) 26,097
Prepaid expenses (13,721) 24,281 (30,893)
Accounts payable and accrued expenses 1,976 11,718 30,740
Income taxes payable (887) 10,671 (2,870)
Realized loss (gain) on derivative instruments, net 4,874 2,308 (92)
Cash pension benefits contributions (29,447) (20,333) (23,728)
Cash postretirement benefits contributions (1,929) (1,835) (1,280)
Proceeds from legal settlement 25,000 0 0
Change in book overdraft 617 (1,167) 1,231
Excess tax benefits from stock-based payment arrangements (1,102) (711) 0
Other, net 1,142 90 (6,478)
Cash provided from (used in) operating activities 184,598 164,047 225,675
Cash flows from investing activities      
Capital expenditures (53,515) (36,406) (89,133)
Deposits for interest rate swap (46,467) (44,072) (38,730)
Return of deposits for interest rate swap 33,600 36,180 23,460
Payments on settlement of interest rate swap (5,148) (2,574) 0
Receipts from settlement of interest rate swap 274 266 0
Proceeds from sale of short-term investment 300 0 0
Acquisition of business (net of cash acquired of $1.8 million in 2010) 0 (41,300) 0
Deposits for interest rate lock agreement 0 0 (5,000)
Return of deposits for interest rate lock agreement 0 0 15,500
Purchase of short-term investment 0 0 (300)
Foundry Park I deferred leasing costs 0 0 (1,500)
Cash provided from (used in) investing activities (70,956) (87,906) (95,703)
Cash flows from financing activities      
Net borrowings (repayments) under revolving credit agreement 18,000 4,000 (41,900)
Repayment on Foundry Park I mortgage loan (2,731) (2,125) 0
Net borrowings under lines of credit 6,529 1,494 0
Repayment of Foundry Park I construction loan 0 (99,102) 0
Draws on Foundry Park I construction loan 0 0 55,603
Borrowing under Foundry Park I mortgage loan 0 68,400 0
Repurchases of common stock (98,093) (121,517) 0
Dividends paid (32,588) (22,608) (16,347)
Debt issuance costs (3,233) (3,992) (465)
Proceeds from exercise of stock options 70 91 40
Excess tax benefits from stock-based payment arrangements 1,102 711 0
Payments on the capital lease (144) (835) (784)
Payment for financed intangible asset 0 (1,000) (1,000)
Cash provided from (used in) financing activities (111,088) (176,483) (4,853)
Effect of foreign exchange on cash and cash equivalents (1,376) (2,297) 4,951
Increase (decrease) in cash and cash equivalents 1,178 (102,639) 130,070
Cash and cash equivalents at end of year $ 50,370 $ 49,192 $ 151,831
[1] For 2011, the petroleum additives segment includes a net gain of $38.7 million related to a legal settlement. See Note 18 for additional information.