Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 8,678	$ 7,059
Adjustments to Reconcile Net Income to Net Cash Used in Operating Activities:
Depreciation and amortization	2,738	3,304
Distribution received from equity method investee	0	3,300
Deferred income taxes, including change in valuation allowance	(490)	(622)
Share-based compensation	1,028	652
Equity method investment earnings	(471)	(517)
Changes in Operating Assets and Liabilities:
Receivables, net	(10,302)	(534)
Inventory	(1,130)	(9,682)
Prepaid expenses	(742)	(289)
Accounts payable	(943)	(4,236)
Accounts payable to affiliate, net	(542)	11
Accrued expenses	(1,627)	(3,958)
Income taxes payable	3,239	4,112
Deferred credit	(201)	(174)
Accrued retirement health and life insurance benefits	(177)	(67)
Net cash used in operating activities	(942)	(1,641)
Cash Flows from Investing Activities
Additions to plant, property and equipment	(6,454)	(3,053)
Net cash used in investing activities	(6,454)	(3,053)
Cash Flows from Financing Activities
Stock shares repurchased	(1,131)	0
Payment of dividends	(688)	0
Principal payments on long-term debt	(89)	(438)
Proceeds from credit facility	10,500	8,099
Payments on credit facility	(2,765)	(3,646)
Loan fees incurred with borrowings	0	(68)
Net cash provided by financing activities	5,827	3,947
Decrease in cash and cash equivalents	(1,569)	(747)
Cash and cash equivalents, beginning of year	1,569	747
Cash and cash equivalents, end of period	$ 0	$ 0