Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Cash provided by operating activities			$ 23,458	$ 30,389
Investing activities:
Capital expenditures	[1]		(11,855)	(7,875)
Proceeds from sale of equipment			343
Proceeds from maturities of certificates of deposit			3,879
Purchase of mining assets				(18,000)
Other				186
Cash used in investing activities			(7,633)	(25,689)
Financing activities:
Payments on bank debt			(13,125)	(14,929)
Bank borrowings				15,000
Debt issuance cost				(2,090)
Dividends			(2,409)	(2,394)
Cash used in financing activities			(15,534)	(4,413)
Increase in cash and cash equivalents			291	287
Cash and cash equivalents, beginning of period			9,788	15,930
Cash and cash equivalents, end of period		$ 10,079	$ 10,079	$ 16,217
Decrease in prepaid assets		$ (1,500)

[1] We acquired $1.5 million in capital equipment in Q2 2017 that was prepaid in a prior period.