Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 85,588	$ 106,142
Accounts receivable, net of allowances for doubtful accounts of $577 and $594	593,619	549,812
Inventory	290,141	255,095
Other current assets	70,886	73,073
Total Current Assets	1,040,234	984,122
Property and Equipment, at cost	1,916,310	1,772,017
Less accumulated depreciation	953,907	878,709
Net Property and Equipment	962,403	893,308
Other Assets:
Goodwill	331,987	333,471
Investments in unconsolidated affiliates	44,921	49,607
Other non-current assets	145,319	140,036
Total Other Assets	522,227	523,114
Total Assets	2,524,864	2,400,544
Current Liabilities:
Accounts payable	136,841	111,381
Accrued liabilities	366,222	335,161
Income taxes payable	59,163	54,833
Total Current Liabilities	562,226	501,375
Long-term Debt	125,000	120,000
Other Long-term Liabilities	212,990	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	206,885	202,619
Treasury stock; 2,531,039 and 2,799,118 shares, at cost	(84,177)	(71,700)
Retained earnings	1,514,866	1,426,525
Accumulated other comprehensive income	(40,635)	(27,191)
Total Shareholders' Equity	1,624,648	1,557,962
Total Liabilities and Sharesholders' Equity	$ 2,524,864	$ 2,400,544