Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 82,235	$ 116,210
Accounts receivable, net	58,631	164,949
Inventories	169,810	145,408
Prepaid expenses and other assets	50,039	36,272
Total current assets	360,715	462,839
Property, plant and equipment, net	608,267	599,474
Goodwill	16,080	16,080
Intangible assets, net	28,886	29,470
Investments	12,946	12,110
Other assets	11,693	12,630
Restricted cash	2,500	4,000
TOTAL ASSETS	1,041,087	1,136,603
CURRENT LIABILITIES:
Lines of credit	22,562	52,844
Current maturities of long-term debt	17,366	15,402
Accounts payable	69,965	99,137
Accrued expenses and other liabilities	31,582	38,916
Deferred revenue	18,942	27,246
Total current liabilities	160,417	233,545
Unfavorable lease obligation	15,058	15,515
Deferred income taxes	21,311	20,279
Long-term contingent consideration for acquisitions	26,108	28,931
Convertible debt conversion liability	27,272	27,100
Long-term debt (net of debt issuance costs of $6,065 and $6,286, respectively)	193,620	196,203
Other liabilities	4,667	4,856
Total liabilities	448,453	526,429
COMMITMENTS AND CONTINGENCIES
EQUITY:
Common stock ($.0001 par value; 300,000,000 shares authorized; 38,594,266 and 38,553,413 shares outstanding, respectively)	5	5
Common stock—additional paid-in-capital	481,943	480,906
Retained earnings	198,093	214,007
Accumulated other comprehensive loss	(5,200)	(5,751)
Treasury stock (9,270,496 and 9,246,002 shares outstanding, respectively)	(82,207)	(81,824)
Total equity attributable to the Company's shareholders	592,634	607,343
Non-controlling interest	0	2,831
Total equity	592,634	610,174
TOTAL LIABILITIES AND EQUITY	$ 1,041,087	$ 1,136,603