Consolidated Statement of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net income	[1]	$ 12,510	$ 20,132	$ 10,219
Deferred income taxes		(3,859)	7,452	(1,723)
Equity (income) loss		1,436	1,606	(5,520)
Cash distributions		3,977		8,109
DD&A		35,565	43,942	29,262
Asset impairment charge		16,560
Loss on sale of assets		197
Change in fair value of interest rate swaps		(637)	159	658
Amortization and write off deferred financing costs		2,325	1,394	1,572
Amount of purchased coal contracts		1,593
Accretion of ARO		1,029	498	534
Share-based compensation		2,539	3,134	3,220
Taxes paid on vesting of RSUs		(1,098)	(1,029)	(1,067)
Change in current assets and liabilities:
Accounts receivable		(5,632)	10,627	(324)
Coal inventory		4,815	4,807	6,540
Parts and supply inventory		1,164	3,664	1,083
Prepaid income taxes		5,312	448	(160)
Accounts payable and accrued liabilities		(11,193)	(1,686)	1,409
Other		(5,685)	(492)	2,054
Cash provided by operating activities		60,918	94,656	55,866
Investing activities:
Capital expenditures		(19,832)	(31,167)	(25,835)
Purchase of mining assets		(22,358)
Purchase of certificates of deposit		(7,315)
Acquisition				(311,453)
Other		189	641
Cash used in investing activities		(49,316)	(30,526)	(337,288)
Financing activities:
Payments on bank debt		(34,855)	(56,875)	(59,655)
Bank borrowings		24,000		350,000
Deferred financing costs		(2,090)		(6,884)
Dividends		(4,799)	(4,794)	(4,798)
Cash (used in) provided by financing activities		(17,744)	(61,669)	278,663
Increase (decrease) in cash and cash equivalents		(6,142)	2,461	(2,759)
Cash and cash equivalents, beginning of year		15,930	13,469	16,228
Cash and cash equivalents, end of year		9,788	15,930	13,469
Cash paid for interest		12,708	14,149	5,008
Cash paid for income taxes				2,334
Cash received for income taxes, net		(5,594)	(956)
Increase in ARO				6,550
Capital expenditures included in accounts payable		$ 1,616	$ 804	$ 748

[1] *There is no material difference between net income and comprehensive income.