Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 77,627	$ 116,210
Accounts receivable, net	90,648	164,949
Inventories	135,547	145,408
Prepaid expenses and other assets	51,880	36,272
Total current assets	355,702	462,839
Property, plant and equipment, net	587,397	599,474
Goodwill	16,080	16,080
Intangible assets, net	27,127	29,470
Investments	12,250	12,110
Other assets	7,040	12,630
Restricted cash	0	4,000
TOTAL ASSETS	1,005,596	1,136,603
CURRENT LIABILITIES:
Revolving lines of credit	65,525	52,844
Current maturities of long-term debt	13,397	15,402
Accounts payable	84,608	99,137
Accrued expenses and other liabilities	39,187	38,916
Deferred revenue	2,218	27,246
Total current liabilities	204,935	233,545
Unfavorable lease obligation	3,388	15,515
Deferred income taxes	8,192	20,279
Long-term contingent consideration for acquisitions	8,849	28,931
Convertible debt conversion liability	0	27,100
Long-term debt (net of debt issuance costs of $6,627 and $6,286, respectively)	208,536	196,203
Other liabilities	4,114	4,856
Total liabilities	438,014	526,429
COMMITMENTS AND CONTINGENCIES
EQUITY:
Common stock ($.0001 par value; 300,000,000 shares authorized; 38,837,749 and 38,553,413 shares outstanding, respectively)	5	5
Common stock—additional paid-in-capital	515,452	480,906
Retained earnings	134,928	214,007
Accumulated other comprehensive income (loss)	278	(5,751)
Treasury stock (9,363,166 and 9,246,002 shares, respectively)	(83,081)	(81,824)
Total equity attributable to the Company's shareholders	567,582	607,343
Noncontrolling interest	0	2,831
Total equity	567,582	610,174
TOTAL LIABILITIES AND EQUITY	$ 1,005,596	$ 1,136,603