UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 88,668	$ 39,293
Restricted cash	7,033	12,772
Accounts receivable, net of allowance for doubtful accounts of $113 and $114, respectively	125,910	99,799
Accounts receivable – related party	4	0
Inventory	29,712	19,336
Derivative assets	1,255	61
Income tax receivable	5,846	13,288
Prepayments and other current assets	2,122	2,964
Total current assets	260,550	187,513
Property and equipment, net	90,577	94,134
Operating lease right-of-use assets, net	7,249	8,051
Intangible assets, net	3,700	4,106
Other assets	2,930	2,383
Total assets	365,006	296,187
Current liabilities:
Accounts payable	151,113	85,991
Derivative liabilities	1,221	52
Current portion of finance lease obligations	4,333	4,112
Current portion of operating lease liabilities	2,184	2,050
Other current liabilities	13,556	22,343
Total current liabilities	172,407	114,548
Other long-term liabilities:
Long-term debt	8,000	0
Asset retirement obligations	2,342	2,308
Finance lease obligations	11,246	11,507
Operating lease liabilities	5,067	6,000
Deferred taxes and other liabilities	11,093	12,732
Total liabilities	210,155	147,095
Commitments and contingencies (Note 15)
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, 4,251,015 and 4,243,716 shares outstanding, respectively	424	423
Contributed capital	13,655	13,340
Retained earnings	140,772	135,329
Total shareholders’ equity	154,851	149,092
Total liabilities and shareholders’ equity	$ 365,006	$ 296,187