Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share Reconciliation
Net income available to common shareholders	$ 73,296	$ 69,630	$ 183,454	$ 108,423
Basic weighted average number of common shares outstanding (in shares)	331,748,552	331,318,381	331,675,313	331,024,531
Plus: Common stock equivalents (in shares)	1,211,250	1,577,102	1,254,046	1,575,460
Diluted weighted average number of common shares outstanding (in shares)	332,959,802	332,895,483	332,929,359	332,599,991
Earnings per common share:
Basic (usd per share)	$ 0.22	$ 0.21	$ 0.55	$ 0.33
Diluted (usd per share)	$ 0.22	$ 0.21	$ 0.55	$ 0.33
Anti-dilutive common stock options and warrants (in shares)	482,000		494,000	2,900,000