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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Cash Flows [Abstract]    
Cash and cash equivalents at beginning of year $ 93,424 $ 103,003
Cash flows from operating activities:    
Net income 61,931 63,947
Adjustments to reconcile net income to cash flows from operating activities:    
Depreciation and amortization 10,680 10,186
Noncash pension and postretirement expense 3,039 5,837
Deferred income tax expense 1,671 818
Unrealized loss (gain) on derivative instruments, net 1,372 (95)
Working capital changes (7,901) (13,806)
Cash pension and postretirement contributions (6,383) (6,730)
Other, net 9,858 (3,605)
Cash provided from (used in) operating activities 74,267 56,552
Cash flows from investing activities:    
Capital expenditures (28,446) (20,424)
Deposits for interest rate swap (4,965) (7,118)
Return of deposits for interest rate swap 3,760 6,750
Other, net (2,482) (2,503)
Cash provided from (used in) investing activities (32,133) (23,295)
Cash flows from financing activities:    
Net borrowings under revolving credit facility 45,000 10,000
Dividends paid (18,959) (17,421)
Repurchases of common stock (35,815) (1,042)
Other, net (3,066) (3,022)
Cash provided from (used in) financing activities (12,840) (11,485)
Effect of foreign exchange on cash and cash equivalents (462) (5,532)
Increase in cash and cash equivalents 28,832 16,240
Cash and cash equivalents at end of period 122,256 119,243
Supplemental disclosure of non-cash transactions:    
Non-cash additions to property, plant, and equipment 9,975 5,433
Non-cash obligation under capital lease $ 5,068 $ 0