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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Significant Accounting Policies |
Schedule of carrying amount of goodwill by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Years Ended December 31, |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​
Technical Services | ​ | $ | 30,992 | ​ | $ | 30,992
Support Services | ​ |  | 1,158 | ​ |  | 1,158
Goodwill | ​ | $ | 32,150 | ​ | $ | 32,150
Schedule of reconciliation of weighted average shares outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In thousands except per share data ) |  | 2019 |  | 2018 |  | 2017
Net (loss) income available for stockholders | ​ | $ | (87,111) | ​ | $ | 175,402 | ​ | $ | 162,511
Less: Adjustments for losses attributable to participating securities | ​ | ​ | (334) | ​ | ​ | (1,839) | ​ | ​ | (2,102)
Net (loss) income used in calculating per share amounts | ​ | $ | (87,445) | ​ | $ | 173,563 | ​ | $ | 160,409
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding (including participating securities) | ​ |  | 214,730 | ​ |  | 215,198 | ​ |  | 217,194
Adjustment for participating securities | ​ |  | (2,509) | ​ |  | (2,453) | ​ |  | (2,891)
Shares used in calculating basic and diluted (loss) earnings per share | ​ |  | 212,221 | ​ |  | 212,745 | ​ |  | 214,303

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