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Stockholders' equity - Preferred stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended
	Feb. 24, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Stockholders Equity Note
Stockholders' equity		$ 5,897,559	$ 6,028,687	$ 5,669,605	$ 6,016,779
Preferred Stock
Stockholders Equity Note
Stockholders' equity		$ 22,143	$ 22,143	$ 22,143	$ 50,160
Preferred Stock \| 2008 Series B Preferred Stock
Stockholders Equity Note
Preferred stock redemption price per share	$ 25.00
Accrued and unpaid dividends on each share	0.1375
Dividends perferred stock per share	$ 25.1375

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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