Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share Reconciliation
Net income available to common shareholders	$ 110,158	$ 38,793
Basic weighted average number of common shares outstanding (in shares)	331,601,260	330,727,416
Plus: Common stock equivalents (in shares)	1,233,206	1,738,111
Diluted weighted average number of common shares outstanding (in shares)	332,834,466	332,465,527
Earnings per common share:
Basic (usd per share)	$ 0.33	$ 0.12
Diluted (usd per share)	$ 0.33	$ 0.12
Anti-dilutive common stock options and warrants (in shares)	1,300,000	2,900,000