Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities
Net income	$ 15,047	$ 13,367
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and amortization	5,554	5,983
Distribution received from equity method investee	7,131	3,300
Deferred income taxes, including change in valuation allowance	577	(749)
Share-based compensation	1,737	1,234
Equity method investment earnings	348	(1,596)
Other, net	0	(230)
Changes in Operating Assets and Liabilities:
Receivables, net	(8,845)	(3,328)
Inventory	(6,693)	(12,894)
Prepaid expenses	(1,148)	270
Accounts payable	(671)	(2,106)
Accounts payable to affiliate, net	(168)	196
Accrued expenses	(934)	(2,814)
Income taxes payable	(426)	57
Deferred credit	(410)	(348)
Accrued retirement health and life insurance benefits	(256)	(124)
Net cash provided by operating activities	10,843	218
Cash Flows from Investing Activities
Additions to plant, property and equipment	(9,933)	(6,088)
Return of equity method investment	299	0
Other, net	0	230
Net cash used in investing activities	(9,634)	(5,858)
Cash Flows from Financing Activities
Stock shares repurchased	(1,131)	0
Payment of dividends	(1,376)	(1,378)
Principal payments on long-term debt	(177)	(2,173)
Proceeds from credit facility	12,467	17,064
Payments on credit facility	(4,650)	(6,952)
Loan fees incurred with borrowings	0	(114)
Net cash provided by financing activities	5,133	6,447
Increase in cash and cash equivalents	6,342	807
Cash and cash equivalents, beginning of year	1,569	747
Cash and cash equivalents, end of period	$ 7,911	$ 1,554