Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net income	$ 5,070	$ 4,785
Adjustments to Reconcile Net Income to Net Cash Provided by (Used In) Operating Activities:
Depreciation and amortization	3,091	3,042
Deferred income taxes	2,027	0
Share based compensation	205	149
Equity method investment earnings	(1,352)	(3,334)
Changes in Operating Assets and Liabilities:
Receivables, net	(194)	(4,050)
Inventory	(3,213)	4,042
Prepaid expenses	(564)	(942)
Accrued income taxes	962	208
Accounts payable	819	(3,352)
Accounts payable to affiliate, net	685	1,360
Accrued expenses	(1,248)	(1,951)
Deferred credit	(160)	(155)
Accrued retirement health and life insurance benefits and other noncurrent liabilities	(127)	(214)
Other	120	(230)
Net cash provided by (used in) operating activities	6,121	(642)
Cash Flows from Investing Activities
Additions to property and equipment	(5,030)	(2,182)
Net cash used in investing activities	(5,030)	(2,182)
Cash Flows from Financing Activities
Purchase of treasury stock	0	(104)
Principal payments on long-term debt	(398)	(384)
Proceeds from revolving credit facility	1,086	14,776
Payments on revolving credit facility	(738)	(14,321)
Loan fees incurred with borrowings	(291)	0
Net cash used in financing activities	(341)	(33)
Increase (Decrease) in cash and cash equivalents	750	(2,857)
Cash and cash equivalents, beginning of year	5,641	2,857
Cash and cash equivalents, end of period	$ 6,391	$ 0