Consolidated Statement of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	[1]	$ 20,132	$ 10,219	$ 22,423
Liability extinguishment				(4,300)
Deferred income taxes		7,452	(1,723)	7,441
Equity (income) loss		1,606	(5,520)	(6,456)
Cash distributions			8,109	1,325
DD&A		43,942	29,262	18,585
Change in fair value of interest rate swaps		159	658
Amortization and write off deferred financing costs		1,394	1,572	299
Accretion of ARO		498	534	182
Share-based compensation		3,134	3,220	2,155
Taxes paid on vesting of RSUs		(1,029)	(1,067)	(780)
Change in current assets and liabilities:
Accounts receivable		10,627	(324)	(2,394)
Coal inventory		4,807	6,540	(2,436)
Parts and supply inventory		3,664	1,083	(562)
Income taxes		448	(160)	(6,814)
Accounts payable and accrued liabilities		(1,686)	1,409	1,130
Other		(492)	2,054	(2,617)
Cash provided by operating activities		94,656	55,866	27,181
Investing activities:
Capital expenditures for coal properties		(31,167)	(25,835)	(31,392)
Acquisition			(311,453)
Other		641		(2,573)
Cash used in investing activities		(30,526)	(337,288)	(33,965)
Financing activities:
Payments on bank debt		(56,875)	(59,655)
Bank borrowings			350,000	4,600
Deferred financing costs			(6,884)
Dividends		(4,794)	(4,798)	(3,476)
Cash (used in) provided by financing activities		(61,669)	278,663	1,124
Increase (decrease) in cash and cash equivalents		2,461	(2,759)	(5,660)
Cash and cash equivalents, beginning of year		13,469	16,228	21,888
Cash and cash equivalents, end of year		15,930	13,469	16,228
Cash paid for interest		14,149	5,008	1,028
Cash paid for income taxes			2,334	6,045
Cash received for income taxes, net		(291)
Increase in ARO			6,550	2,535
Capital expenditures included in accounts payable		$ 804	$ 748	$ 84

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