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Earning Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Common Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2018			2017			2016
	(In thousands, except per share data)
Net income	$	84,410		$	52,646		$	59,186
Less: Dividends on preferred stock
Non-convertible preferred stock (Series A, B, and D)		(6,511)			(6,512)			(6,512)
Convertible preferred stock (Series C)		(5,513)			(7,350)			(7,350)
Income available to common shareholders	$	72,386		$	38,784		$	45,324
Effect of assumed conversion of the convertible preferred stock		5,513			7,350			7,350
Income available to common shareholders assuming conversion	$	77,899		$	46,134		$	52,674

Weighted average common shares and share equivalents:
Average common shares outstanding		45,400			43,939			43,913
Effect of dilutive securities:
Average potential common shares-options		142			19			37
Average potential common shares-assuming conversion of convertible preferred stock		5,807			7,138			7,138
Total weighted average common shares outstanding and equivalents		51,349			51,096			51,088
Earnings per common share - basic	$	1.59		$	0.88		$	1.03
Earnings per common share - diluted	$	1.52		$	0.88		$	1.03