Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 6,361	$ 15,502
Restricted cash (Note 8)	4,726	4,592
Certificates of deposit	245	488
Marketable securities	2,023	1,842
Accounts receivable	21,722	18,428
Prepaid Income Taxes Current	1,614	2,606
Inventory	26,962	20,507
Parts and supplies, net of allowance of $274 and $1,595, respectively	12,041	9,645
Prepaid expenses	7,568	11,368
Total current assets	83,262	84,978
Property, plant and equipment, at cost:
Land and mineral rights	131,890	130,897
Building And Equipment Gross	387,699	365,481
Mine development	147,349	140,990
Total property, plant and equipment, at cost	666,938	637,368
Less - accumulated DD&A	(259,121)	(224,730)
Total property, plant and equipment, net	407,817	412,638
Investment in subsidiaries (Note 4)	3,315	3,666
Other assets (Note 5)	14,417	14,217
Total assets	508,811	515,499
Current liabilities:
Current portion of bank debt, net (Note 3)	31,333	25,392
Accounts payable and accrued liabilities (Note 6)	37,106	26,421
Total current liabilities	68,439	51,813
Long-term liabilities:
Bank debt, net (Note 3)	133,697	155,655
Deferred income taxes	23,700	26,441
Asset retirement obligations (ARO)	15,304	14,586
Other	11,164	8,130
Total long-term liabilities	183,865	204,812
Total liabilities	252,304	256,625
Redeemable noncontrolling interests (Note 14)	4,000	4,000
Stockholders' equity:
Common stock, $.01 par value, 100,000 shares authorized; 30,249 and 30,245 outstanding	302	302
Additional paid-in capital	102,166	100,742
Retained earnings	150,039	153,830
Total stockholders' equity	252,507	254,874
Total liabilities , redeemable noncontrolling interests, and stockholders' equity	$ 508,811	$ 515,499