Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 76,290	$ 51,178
Accounts receivable, net	40,259	36,818
Inventory	26,080	17,640
Other current assets	5,221	5,183
Total current assets	147,850	110,819
Property, plant & equipment, net	92,999	94,187
Intangibles, net	11,798	15,118
Goodwill	15,714	15,714
Deferred tax assets, net	87,010	65
Other long-term assets	28,487	19,995
Total assets	383,858	255,898
Current liabilities
Current portion of long-term debt	2,750	3,650
Revolving line of credit	0	0
Accounts payable	17,464	18,940
Accrued expenses and other liabilities	26,536	21,249
Total current liabilities	46,750	43,839
Asset retirement obligations	10,412	9,370
Long-term debt, net	265,393	274,460
Other long-term liabilities	38,012	34,745
Total liabilities	360,567	362,414
Commitments and contingencies (see Note 14)
Stockholders’ equity (deficit)
Preferred stock ($0.01 par value, 25,000 shares authorized; no shares issued and outstanding)	0	0
Common stock ($0.01 par value, 250,000 shares authorized; 37,765 and 36,756 shares issued and outstanding, respectively)	378	367
Additional paid-in capital	232,960	226,462
Accumulated deficit	(209,013)	(332,398)
Accumulated other comprehensive loss	(1,034)	(947)
Total stockholders’ equity (deficit)	23,291	(106,516)
Total liabilities and stockholders’ equity (deficit)	$ 383,858	$ 255,898