Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income/(loss)	$ (16,687)	$ 82,839
Preferred stock dividends	2,438	2,438
Net income/(loss) available to common stockholders	$ (19,125)	$ 80,401
Denominator:
Basic earnings per share - weighted average shares	50,373,580	50,229,797
Effect of employee stock-based awards	101,222	115,602
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,474,802	50,345,399
Basic earnings/(loss) per common share	$ (0.38)	$ 1.60
Diluted earnings/(loss) per common share	$ (0.38)	$ 1.60
Stock options excluded from computation of EPS	428,007	411,065