UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 126,999	$ 109,393
Accounts receivable, net of allowance for doubtful accounts of $271 and $303, respectively	118,533	121,353
Inventory	21,513	12,192
Derivative assets	538	166
Income tax receivable	0	1,317
Prepayments and other current assets	1,197	1,264
Total current assets	268,780	245,685
Property and equipment, net	27,304	29,362
Investments in unconsolidated affiliates	425	425
Cash deposits and other assets	6,618	7,232
Total assets	303,127	282,704
Current liabilities:
Accounts payable	140,296	124,706
Accounts payable – related party	5	5
Derivative liabilities	514	145
Current portion of capital lease obligations	345	338
Other current liabilities	6,845	4,404
Total current liabilities	148,005	129,598
Other long-term liabilities:
Asset retirement obligations	1,405	1,273
Capital lease obligations	1,177	1,351
Deferred taxes and other liabilities	2,516	3,363
Total liabilities	153,103	135,585
Commitments and contingencies (Note 12)
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	11,696	11,693
Retained earnings	137,906	135,004
Total shareholders’ equity	150,024	147,119
Total liabilities and shareholders’ equity	$ 303,127	$ 282,704