Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 46,743	$ 37,392
Marketable securities	82,594	89,348
Accounts receivable, net	58,448	52,410
Inventories	236,288	226,191
Prepaid expenses	8,826	8,995
Income taxes recoverable	39	1,226
Deferred income taxes	1,134	0
Total current assets	434,072	415,562
Property and equipment, net	595,483	575,003
Goodwill	35,162	35,162
Intangible and other assets, net	3,314	3,277
Deferred income taxes	229	0
Total assets	1,068,260	1,029,004
Liabilities
Accounts payable	131,657	132,092
Accrued expenses	31,801	31,298
Accrued self-insurance	18,730	18,103
Deferred revenue, net	4,267	6,197
Income taxes payable	12,087	0
Deferred income taxes	4,279	4,130
Total current liabilities	202,821	191,820
Postretirement benefit obligations	15,467	14,434
Deferred income taxes	71,420	73,081
Other	5,283	3,783
Total liabilities	294,991	283,118
Shareholders' Equity
Common stock, no par value, 100,800,000 shares authorized, 33,047,807 shares issued	9,949	9,949
Retained earnings	908,437	881,346
Accumulated other comprehensive income (Net of deferred taxes of $4,003 in 2012 and $3,800 in 2011)	5,740	5,448
Shareholders' equity before treasury stock	924,126	896,743
Treasury stock at cost, 6,149,364 shares	(150,857)	(150,857)
Total shareholders' equity	773,269	745,886
Total liabilities and shareholders' equity	$ 1,068,260	$ 1,029,004