Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 15,502	$ 12,483
Restricted cash (Note 10)	4,592	3,811
Certificates of deposit	488	1,495
Marketable securities	1,842	1,907
Accounts receivable	18,428	16,762
Prepaid income taxes	2,606	2,899
Inventory	20,507	12,804
Parts and supplies, net of allowance of $1,595 and $795 in 2018 and 2017, respectively	9,645	10,043
Prepaid expenses	11,368	5,482
Total current assets	84,978	67,686
Property, plant and equipment, at cost:
Land and mineral rights	130,897	129,724
Buildings and equipment	365,481	360,862
Mine development	140,990	136,762
Total property, plant and equipment, at cost	637,368	627,348
Less - accumulated DD&A	(224,730)	(203,391)
Total property, plant and equipment, net	412,638	423,957
Other assets (Note 7)	14,217	14,660
Total assets	515,499	518,193
Current liabilities:
Current portion of bank debt, net (Note 3)	25,392	33,171
Accounts payable and accrued liabilities (Note 8)	26,421	21,115
Total current liabilities	51,813	54,286
Long-term liabilities:
Bank debt, net (Note 3)	155,655	165,773
Deferred income taxes	26,441	28,728
Asset retirement obligations (ARO)	14,586	13,506
Other	8,130	6,577
Total long-term liabilities	204,812	214,584
Total liabilities	256,625	268,870
Redeemable noncontrolling interests (Note 15)	4,000
Stockholders' equity:
Preferred stock, $.10 par value, 10,000 shares authorized; none issued
Common stock, $.01 par value, 100,000 shares authorized; 30,245 and 29,955 shares outstanding, respectively	302	299
Additional paid-in capital	100,742	97,873
Retained earnings	153,830	150,236
Accumulated other comprehensive income		915
Total stockholders' equity	254,874	249,323
Total liabilities , redeemable noncontrolling interests, and stockholders' equity	515,499	518,193
Savoy [Member]
Property, plant and equipment, at cost:
Investment in subsidiaries		8,037
Sunrise Energy [Member]
Property, plant and equipment, at cost:
Investment in subsidiaries	$ 3,666	$ 3,853