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Summary Unaudited Quarterly Financial Information
 12 Months Ended
Dec. 31, 2017
Summary Unaudited Quarterly Financial Information  
Summary Unaudited Quarterly Financial Information

23. Summary Unaudited Quarterly Financial Information

A summary of the unaudited quarterly results of operations for the years ended December 31, 2017 and 2016 is presented below (in thousands except per share amounts).

Year Ended December 31, 2017
First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$195,728$229,201$248,884$213,893
Operating income (loss)(6,951)2,48411,848(2,441)
Net income (loss)(20,108)(6,948)2,57717,839
Income (loss) per common share:
Basic$(0.30)$(0.09)$0.03$0.24
Diluted$(0.30)$(0.09)$0.03$0.23
Closing stock price$4.58$3.53$3.66$4.45

Year Ended December 31, 2016
First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$181,249$174,188$217,073$227,928
Operating income (loss)(25,645)45,92010,86136,131
Net income (loss)(36,375)35,289(1,584)24,511
Income (loss) per common share:
Basic$(0.59)$0.58$(0.03)$0.40
Diluted$(0.59)$0.57$(0.03)$0.39
Closing stock price$1.95$2.06$5.44$5.61

During the first quarter of 2017, Net income (loss) included a charge of $0.9 million related to the early retirement of the 2019 Notes as well as a charge of $0.7 million related to the write-off of deferred financing costs and original issue discount on the 2019 Notes. During the third quarter of 2017, Net income (loss) included $3.1 million in Revenue for business interruption insurance proceeds related to a claim filed in 2016 for lost tonnage due to a customer force majeure. Net income (loss) for the fourth quarter of 2017 included non-cash adjustments of $2.8 million for Depreciation and depletion related to decreases in the ARO liability.

During the first quarter of 2016, Net income (loss) included non-cash impairments of $4.2 million related to engineering costs for the Overland Conveyor project and a shovel that we no longer expect to use because of declining production. During the second quarter of 2016, Net income (loss) included non-cash adjustments of $37.3 million to decrease Depreciation and depletion related to a decrease in the ARO liability. During the third quarter of 2016, we recorded $4.5 million in debt restructuring costs related to the Exchange Offers completed in the fourth quarter. Net income (loss) for the fourth quarter of 2016 included non-cash adjustments of $13.9 million for Depreciation and depletion related to additional decreases in the ARO liability, as well as an additional $0.2 million of debt restructuring costs.