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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 96,360	$ 5,281	$ (20,307)	$ 42,424	$ 16,996	$ (7,640)	$ 81,334	$ 51,780
Weighted average common shares outstanding, basic (in shares)	49,576			48,141			49,034	48,121
Weighed average common shares outstanding, dilutive (in shares)	49,576			48,141			49,034	48,121
Earnings per share - basic (in dollars per share)	$ 1.94			$ 0.88			$ 1.66	$ 1.08
Earnings per share - diluted (in dollars per share)	$ 1.94			$ 0.88			$ 1.66	$ 1.08

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