CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 109,393	$ 87,342
Accounts receivable, net of allowance for doubtful accounts of $303 and $225, respectively	121,353	87,162
Inventory	12,192	13,070
Derivative assets	166	112
Income tax receivable	1,317	2,735
Prepayments and other current assets	1,264	2,097
Total current assets	245,685	192,518
Property and equipment, net	29,362	46,325
Investments in unconsolidated affiliates	425	2,500
Cash deposits and other assets	7,232	5,529
Total assets	282,704	246,872
Current liabilities:
Accounts payable	124,706	79,897
Accounts payable – related party	5	53
Derivative liabilities	145	64
Current portion of capital lease obligations	338	0
Other current liabilities	4,404	6,060
Total current liabilities	129,598	86,074
Other long-term liabilities:
Asset retirement obligations	1,273	2,329
Capital lease obligations	1,351	0
Deferred taxes and other liabilities	3,363	7,157
Total liabilities	135,585	95,560
Commitments and contingencies (Note 13)
Shareholders’ equity:
Preferred stock – $1.00 par value, 960,000 shares authorized, none outstanding	0	0
Common stock – $0.10 par value, 7,500,000 shares authorized, 4,217,596 shares outstanding	422	422
Contributed capital	11,693	11,693
Retained earnings	135,004	139,197
Total shareholders’ equity	147,119	151,312
Total liabilities and shareholders’ equity	$ 282,704	$ 246,872