Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 127,492	$ 106,142
Accounts receivable, net of allowances for doubtful accounts of $577 and $594	519,099	549,812
Inventory	257,052	255,095
Other current assets	69,424	73,073
Total Current Assets	973,067	984,122
Property and Equipment, at cost	1,870,038	1,772,017
Less accumulated depreciation	921,416	878,709
Net Property and Equipment	948,622	893,308
Other Assets:
Goodwill	339,876	333,471
Investments in unconsolidated affiliates	46,639	49,607
Other non-current assets	146,308	140,036
Total Other Assets	532,823	523,114
Total Assets	2,454,512	2,400,544
Current Liabilities:
Accounts payable	125,589	111,381
Accrued liabilities	353,675	335,161
Income taxes payable	46,730	54,833
Total Current Liabilities	525,994	501,375
Long-term Debt	100,000	120,000
Other Long-term Liabilities	216,563	221,207
Commitments and Contingencies
Stockholders' Equity:
Common Stock, par value $0.25; 180,000,000 shares authorized; 110,834,088 shares issued	27,709	27,709
Additional paid-in capital	202,744	202,619
Treasury stock; 2,531,039 and 2,799,118 shares, at cost	(64,833)	(71,700)
Retained earnings	1,461,735	1,426,525
Accumulated other comprehensive income	(15,400)	(27,191)
Total Shareholders' Equity	1,611,955	1,557,962
Total Liabilities and Sharesholders' Equity	$ 2,454,512	$ 2,400,544