Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 205,853	$ 234,127
Accounts and other receivables, net	164,052	119,171
Income tax receivable	241	3,741
Inventories	126,817	105,515
Deferred income tax asset	39,097	13,786
Prepaid expenses and other current assets	34,189	28,275
Total current assets	570,249	504,615
Equity method investments	32,196	42,811
Property, plant and equipment, net	1,400,064	1,380,202
Goodwill	62,885	62,885
Other assets, net	180,070	185,625
Total assets	2,245,464	2,176,138
Current liabilities:
Accounts payable	411,743	315,721
Accrued liabilities	103,093	93,780
Current portion of long-term debt	16,408	16,420
Total current liabilities	531,244	425,921
Other non-current liabilities	175,372	165,935
Long-term debt	535,856	539,542
Deferred income tax liability	376,085	380,580
Total liabilities	1,618,557	1,511,978
Commitments and contingencies (Note 17)
Stockholders’ equity:
Common stock, par value $0.01, 150,000,000 shares authorized; 71,163,098 and 70,960,461 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	712	710
Additional paid-in capital	529,674	526,035
Accumulated other comprehensive loss, net of tax	(29,583)	(28,808)
Retained earnings	64,139	141,201
Total stockholders’ equity	564,942	639,138
Non-controlling interest in subsidiaries	61,965	25,022
Total equity	626,907	664,160
Total liabilities and equity	$ 2,245,464	$ 2,176,138