CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities:
Net income	$ 4,924	$ 10,210
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	7,885	7,316
Amortization of deferred financing costs	23	23
Deferred income taxes	(228)	165
Gain on sale of property, plant and equipment	(111)	(11)
Stock-based compensation	575	524
Changes in operating assets and liabilities:
Trade receivables, net	717	(3,640)
Inventories	(201)	2,149
Prepaid expenses and other current assets	1,197	446
Other assets	(18)	1
Accounts payable and accrued expenses	(1,616)	(1,445)
Other liabilities	630	200
Net cash provided by operating activities	13,777	15,938
Investing Activities:
Purchase of property, plant and equipment	(6,310)	(5,547)
Proceeds from sale of property, plant and equipment	199	211
Net cash used in investing activities	(6,111)	(5,336)
Financing Activities:
Repayments of term loans	(16,667)	(2,500)
Cash dividends paid	(1,399)	(1,394)
Purchase of treasury shares	(158)	(168)
Net cash used in financing activities	(18,224)	(4,062)
Net (decrease) increase in cash and cash equivalents	(10,558)	6,540
Cash and cash equivalents at beginning of period	58,332	49,475
Cash and cash equivalents at end of period	$ 47,774	$ 56,015