Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Net income	$ 48,559	$ 14,931
Basic earnings per share:
Income available to common stockholders, basic	$ 48,559	$ 14,931
Weighted average common shares outstanding, basic (in shares)	76,516,543	64,386,138
Income available to common stockholders, per share amount, basic (usd per share)	$ 0.63	$ 0.23
Dilutive shares (in shares)	64,319	71,125
Diluted earnings per share:
Income available to common stockholders, diluted	$ 48,559	$ 14,931
Weighted average common shares outstanding, diluted (in shares)	76,580,862	64,457,263
Income available to common stockholders, per share amount, diluted (usd per share)	$ 0.63	$ 0.23