Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 78,062	$ 113,401
Accounts receivable, net	40,632	43,753
Inventory	30,596	33,019
Other current assets	5,096	5,242
Total current assets	154,386	195,415
Property, plant and equipment, net	113,531	107,888
Intangibles, net	7,786	9,133
Goodwill	15,714	15,714
Deferred tax assets, net	77,745	81,449
Other long-term assets	33,247	30,232
Total assets	402,409	439,831
Current liabilities
Current portion of long-term debt and other borrowings	10,166	2,750
Accounts payable	16,492	17,955
Accrued expenses and other liabilities	32,928	32,050
Total current liabilities	59,586	52,755
Asset retirement obligations	12,560	11,572
Long-term debt, net and other borrowings	186,373	263,709
Other long-term liabilities	42,724	40,793
Total liabilities	301,243	368,829
Commitments and contingencies (See Note 14)
Stockholders’ equity
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; 39,229 and 38,466 shares issued and outstanding, respectively)	392	385
Additional paid-in capital	248,694	239,865
Accumulated deficit	(146,923)	(168,140)
Accumulated other comprehensive loss	(997)	(1,108)
Total stockholders’ equity	101,166	71,002
Total liabilities and stockholders’ equity	$ 402,409	$ 439,831