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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Cash Flows [Abstract]    
Cash and cash equivalents at beginning of year $ 89,129 $ 50,370
Cash flows from operating activities:    
Net income 67,835 66,547
Adjustments to reconcile net income to cash flows from operating activities:    
Depreciation and amortization 11,796 10,482
Noncash environmental remediation and dismantling 281 251
Noncash pension benefits expense 4,569 3,792
Noncash postretirement benefits expense 877 993
Noncash foreign exchange (gain) loss (86) 1,215
Deferred income tax expense 1,742 3,077
Loss on early extinguishment of debt 0 [1] 3,221 [1]
Restricted stock award 244 0
Unrealized gain on derivative instruments, net (3,212) (4,208)
Working capital changes (55,707) (22,877)
Realized loss on derivative instruments, net 2,535 2,474
Cash pension benefits contributions (7,573) (7,355)
Cash postretirement benefits contributions (458) (628)
Change in book overdraft 1,243 6,032
Other, net 3,042 74
Cash provided from (used in) operating activities 27,128 63,090
Cash flows from investing activities:    
Capital expenditures (16,109) (7,432)
Deposits for interest rate swap (2,982) (5,079)
Return of deposits for interest rate swap 6,850 8,340
Payments on settlement of interest rate swap (2,617) (2,574)
Receipts from settlement of interest rate swap 82 100
Cash provided from (used in) investing activities (14,776) (6,645)
Cash flows from financing activities:    
Net borrowings (repayments) under revolving credit facility 1,000 (22,000)
Repayment of Foundry Park I mortgage loan 0 (715)
Net borrowings (repayments) under lines of credit 811 (223)
Dividends paid (11,998) (10,054)
Debt issuance costs (1,115) (2,351)
Repurchases of common stock (22,508) 0
Cash provided from (used in) financing activities (33,810) (35,343)
Effect of foreign exchange on cash and cash equivalents (3,658) 1,274
(Decrease) increase in cash and cash equivalents (25,116) 22,376
Cash and cash equivalents at end of period $ 64,013 $ 72,746
[1] In March 2012, we entered into a $650 million five-year unsecured revolving credit facility which replaced our previous $300 million unsecured revolving credit facility. During 2012, we used a portion of the $650 million revolving credit facility to fund the early redemption of all of our then outstanding 7.125% senior notes (7.125% senior notes), as well as to repay the outstanding principal amount on the Foundry Park I mortgage loan. As a result, during the three months ended March 31, 2012, we recognized a loss on early extinguishment of debt of $3.2 million from accelerated amortization of financing fees associated with the prior revolving credit facility and costs associated with redeeming the 7.125% senior notes prior to maturity.