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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
RECENT ACCOUNTING STANDARDS |
Schedule of carrying amount of goodwill by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | Technical Services |  | Support Services | ​ | Total
Beginning balance at December 31, 2022 | $ | 30,992 | ​ | $ | 1,158 |  | $ | 32,150
Business acquisition (see note titled Business Acquisition) | ​ | 18,674 |  | ​ | — | ​ | ​ | 18,674
Ending balance at December 31, 2023 | $ | 49,666 | ​ | $ | 1,158 | ​ | $ | 50,824
Schedule of reconciliation of weighted average shares outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | 2023 |  | 2022 |  | 2021
Net income available for stockholders | ​ | $ | 195,113 | ​ | $ | 218,363 | ​ | $ | 7,217
Less: Adjustments for earnings attributable to participating securities | ​ | ​ | (3,099) | ​ | ​ | (3,197) | ​ | ​ | (89)
Net income used in calculating earnings per share | ​ | $ | 192,014 | ​ | $ | 215,166 | ​ | $ | 7,128
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding (including participating securities) | ​ |  | 216,472 | ​ |  | 216,518 | ​ |  | 215,646
Adjustment for participating securities | ​ |  | (3,545) | ​ |  | (3,187) | ​ |  | (2,656)
Shares used in calculating basic and diluted earnings per share | ​ |  | 212,927 | ​ |  | 213,331 | ​ |  | 212,990

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