Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 57,154	$ 51,178
Accounts receivable, net	43,246	36,818
Inventory	21,151	17,640
Other current assets	4,072	5,183
Total current assets	125,623	110,819
Property, plant & equipment, net	91,863	94,187
Intangibles, net	13,456	15,118
Goodwill	15,714	15,714
Other long-term assets	21,222	20,060
Total assets	267,878	255,898
Current liabilities
Current portion of long-term debt	2,750	3,650
Revolving line of credit	0	0
Accounts payable	17,674	18,940
Accrued expenses and other liabilities	22,640	21,249
Total current liabilities	43,064	43,839
Asset retirement obligations	9,891	9,370
Long-term debt, net	265,929	274,460
Other long-term liabilities	36,174	34,745
Total liabilities	355,058	362,414
Commitments and contingencies (See Note 12)
Stockholders' deficit
Preferred stock ($0.01 par value, 25,000 shares authorized; no shares issued and outstanding)
Common stock ($0.01 par value, 250,000 shares authorized; 37,348 and 36,756 shares issued and outstanding, respectively)	373	367
Additional paid-in capital	228,083	226,462
Accumulated deficit	(314,665)	(332,398)
Accumulated other comprehensive loss	(971)	(947)
Total stockholders' deficit	(87,180)	(106,516)
Total liabilities and stockholders' deficit	$ 267,878	$ 255,898