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Net income per common share - Computation of net income (loss) per common share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss)	$ 171,106	$ 279,783	$ 339,031	$ 371,107
Net Income	171,106	279,783	339,031	371,107
Preferred stock dividends	(931)	(931)	(1,862)	(1,862)
Net income (loss) applicable to common stock	$ 170,175	$ 278,852	$ 337,169	$ 369,245
Average common shares outstanding	96,305,118	101,892,402	97,437,141	101,794,914
Average potential dilutive common shares	152,330	139,553	154,848	137,563
Average common shares outstanding - assuming dilution	96,457,448	102,031,955	97,591,989	101,932,477
Net Income per Common Share - Basic	$ 1.77	$ 2.74	$ 3.46	$ 3.63
Net Income per Common Share - Diluted	$ 1.76	$ 2.73	$ 3.45	$ 3.62

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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