Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 883	$ 2,857
Receivables (less allowance for doubtful accounts: June 30, 2014 - $7; December 31, 2013 - $18)	34,737	27,821
Inventory	31,947	34,917
Prepaid expenses	2,097	848
Deferred income taxes	3,303	4,977
Refundable income taxes	176	466
Total current assets	73,143	71,886
Property and equipment	196,796	194,687
Less accumulated depreciation and amortization	(130,342)	(124,443)
Property and equipment, net	66,454	70,244
Equity method investments	12,786	7,123
Other assets	2,391	2,076
Total assets	154,774	151,329
Current Liabilities
Current maturities of long-term debt	1,583	1,557
Accounts payable	18,342	23,107
Accounts payable to affiliate, net	3,268	1,204
Accrued expenses	7,314	8,282
Total current liabilities	30,507	34,150
Long-term debt, less current maturities	2,814	3,611
Revolving credit facility	19,009	18,000
Deferred credit	4,098	3,925
Accrued retirement health and life insurance benefits	3,720	4,423
Other noncurrent liabilities	684	640
Deferred income taxes	3,303	4,977
Total liabilities	64,135	69,726
Commitments and Contingencies – (Note 4)
Capital stock
Preferred, 5% non-cumulative; $10 par value; authorized 1,000 shares; issued and outstanding 437 shares	4	4
Common stock
No par value; authorized 40,000,000 shares; issued 18,115,965 shares at June 30, 2014 and December 31, 2013, 17,643,371 and 17,750,421 shares outstanding at June 30, 2014 and December 31, 2013, respectively	6,715	6,715
Additional paid-in capital	8,879	8,728
Retained earnings	75,663	66,686
Accumulated other comprehensive loss, net of tax	321	(4)
Treasury stock, at cost
Shares of 472,594 and 365,544 at June 30, 2014 and December 31, 2013, respectively	(943)	(526)
Total stockholders’ equity	90,639	81,603
Total liabilities and stockholders’ equity	$ 154,774	$ 151,329