Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 68,861	$ 79,612
Accounts receivable, net	58,991	54,002
Inventory	30,357	35,744
Other current assets	10,145	9,625
Total current assets	0	5,242
Total current assets	168,354	184,225
Property, plant and equipment, net	118,381	120,171
Intangibles, net	371,331	376,012
Goodwill	61,189	58,632
Deferred tax assets, net	62,832	70,147
Other long-term assets	61,361	60,634
Total assets	843,448	869,821
Current liabilities
Current portion of long-term debt and other borrowings	10,251	20,701
Accounts payable	19,099	16,284
Accrued expenses and other liabilities	35,240	41,726
Liabilities held for sale	0	1,793
Total current liabilities	64,590	80,504
Asset retirement obligations	14,408	14,020
Long-term debt, net and other borrowings	171,474	197,699
Other long-term liabilities	64,857	63,393
Total liabilities	315,329	355,616
Commitments and contingencies (See Note 18)
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; 67,434 and 66,875 shares issued and outstanding, respectively)	674	669
Additional paid-in capital	669,623	665,530
Accumulated deficit	(140,938)	(149,946)
Accumulated other comprehensive loss	(1,240)	(2,048)
Total stockholders’ equity	528,119	514,205
Total liabilities and stockholders’ equity	$ 843,448	$ 869,821