Capital Stock (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of earnings per share

Earnings per share for the quarters and six months ended June 30, 2018 and 2017, respectively, are computed as follows:

	For the Quarter Ended
	June 30, 2018		June 30, 2017
	(dollars in thousands)
Numerator:
Net income available to common shareholders	$	108,708	$	105,617
Effect of dilutive securities:	—		—
Dilutive net income available to common shareholders	$	108,708	$	105,617
Denominator:
Weighted average basic shares	186,994,743		187,779,406
Effect of dilutive securities	427,402		363,145
Weighted average dilutive shares	187,422,145		188,142,551
Net income per average share attributable to common stockholders - Basic	$	0.58	$	0.56
Net income per average share attributable to common stockholders - Diluted	$	0.58	$	0.56

	For the Six Months Ended
	June 30, 2018		June 30, 2017
	(dollars in thousands)
Numerator:
Net income available to common shareholders	$	338,316	$	263,141
Effect of dilutive securities:	—		—
Dilutive net income available to common shareholders	$	338,316	$	263,141
Denominator:
Weighted average basic shares	187,272,469		187,770,626
Effect of dilutive securities	465,974		398,467
Weighted average dilutive shares	187,738,443		188,169,093
Net income per average share attributable to common stockholders - Basic	$	1.81	$	1.40
Net income per average share attributable to common stockholders - Diluted	$	1.80	$	1.40