CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities:
Net income	$ 10,600	$ 15,636
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	11,916	11,091
Amortization of deferred financing costs	25	34
Deferred income taxes	(353)	165
(Gain) loss on sale of property, plant and equipment	(137)	54
Stock-based compensation	908	822
Changes in operating assets and liabilities:
Trade receivables, net	(1,770)	(5,590)
Inventories	(685)	829
Prepaid expenses and other current assets	1,623	213
Other assets	(20)	1
Accounts payable and accrued expenses	208	(267)
Other liabilities	585	298
Net cash provided by operating activities	22,900	23,286
Investing Activities:
Purchase of property, plant and equipment	(8,080)	(8,725)
Proceeds from sale of property, plant and equipment	263	246
Net cash used in investing activities	(7,817)	(8,479)
Financing Activities:
Repayment of term loans	(16,667)	(3,750)
Cash dividends paid	(2,099)	(2,092)
Exercise of stock options	28
Purchase of treasury shares	(158)	(168)
Net cash used in financing activities	(18,896)	(6,010)
Net (decrease) increase in cash and cash equivalents	(3,813)	8,797
Cash and cash equivalents at beginning of period	58,332	49,475
Cash and cash equivalents at end of period	$ 54,519	$ 58,272