Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 120,549	$ 106,142
Accounts receivable, net of allowances for doubtful accounts of $594 and $5,655	666,930	549,812
Inventory	331,280	255,095
Other current assets	84,231	73,073
Total Current Assets	1,202,990	984,122
Property and Equipment, at cost	2,069,119	1,772,017
Less accumulated depreciation	1,043,987	878,709
Net Property and Equipment	1,025,132	893,308
Other Assets:
Goodwill	363,193	333,471
Investments in unconsolidated affiliates	42,619	49,607
Other	134,184	140,036
Total Other Assets	539,996	523,114
Total Assets	2,768,118	2,400,544
Current Liabilities:
Accounts payable	130,489	111,381
Accrued liabilities	408,303	335,161
Income taxes payable	78,393	54,833
Total Current Liabilities	617,185	501,375
Long-term Debt	94,000	120,000
Other Liabilities, Noncurrent	241,473	221,207
Commitments and Contingencies
Stockholders' Equity:
Common Stock, par value $0.25; 180,000,000 shares authorized; 55,417,044 shares issued	27,709	27,709
Additional paid-in capital	212,940	202,619
Treasury stock; 2,799,118 and 2,603,324 shares, at cost	(84,062)	(71,700)
Retained earnings	1,641,027	1,426,525
Accumulated other comprehensive income	17,846	(27,191)
Total Shareholders' Equity	1,815,460	1,557,962
Total Liabilities and Sharesholders' Equity	$ 2,768,118	$ 2,400,544