Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Reconciliation
Net income available to common shareholders	$ 66,387	$ 36,966	$ 174,810	$ 129,532
Basic weighted average number of common shares outstanding (in shares)	331,486,500	264,058,174	331,180,213	263,938,786
Plus: Common stock equivalents (in shares)	1,513,742	878,046	1,513,867	816,059
Diluted weighted average number of common shares outstanding (in shares)	333,000,242	264,936,220	332,694,080	264,754,845
Earnings per common share:
Basic (usd per share)	$ 0.20	$ 0.14	$ 0.53	$ 0.49
Diluted (usd per share)	$ 0.20	$ 0.14	$ 0.53	$ 0.49
Anti-dilutive common stock options and warrants (in shares)	2,900,000	3,200,000	2,900,000	3,300,000