Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 5,865	$ 14,934
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	3,748	1,895
Stock-based compensation	1,913	1,956
Deferred income taxes	1,602
Currency exchange (gain) loss	(823)	10
Unrealized loss (gain) on investments	1,499	(802)
Other operating adjustments	301
Changes in operating assets and liabilities:
Accounts receivable	728	(3,796)
Inventories	(1,195)	1,104
Prepaid expenses and other current assets	424	433
Accounts payable and other accrued liabilities	703	433
Income taxes payable/receivable	(5,263)	11,588
Other noncurrent assets	(37)
Net cash provided by operating activities	9,465	27,755
Cash flows from investing activities:
Capital expenditures	(11,943)	(7,438)
Investments		(1,805)
Other investing activities	28	16
Net cash used in investing activities	(11,915)	(9,227)
Cash flows from financing activities:
Proceeds from exercise of stock options		100
Dividends paid	(3,251)	(3,243)
Repayments of capital leases	(745)	(731)
Net cash used in financing activities	(3,996)	(3,874)
Effect of exchange rate changes on cash and cash equivalents	(72)
Net (decrease) increase in cash and equivalents	(6,518)	14,654
Cash and equivalents at beginning of period	27,541	14,973
Cash and equivalents at end of period	21,023	29,627
Supplemental Cash Flow Information
Interest expense paid	48	$ 96
Income and mining taxes paid	$ 7,321