Note 4 - Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(Dollars in thousands, except per share amounts)
Numerator:
Net income	$	93,352		$	132,348		$	274,966		$	317,769
Less: Net income allocated to unvested restricted stock		(400	)		(294	)		(1,104	)		(635	)
Net income available to common stockholders for basic earnings per common share		92,952			132,054			273,862			317,134
Effect of dilutive securities:
Interest on 1.625% convertible senior notes due 2018		94			91			1,123			1,088
Interest on 0.25% convertible senior notes due 2019		85			82			1,016			984
Interest on 1.25% convertible senior notes due 2032		48			62			752			744
Net income available to common stock for diluted earnings per share	$	93,179		$	132,289		$	276,753		$	319,950
Denominator:
Weighted average basic common shares outstanding		110,205,460			118,338,891			112,778,362			119,188,145
Effect of dilutive securities:
Share-based awards		875,214			643,602			881,500			605,860
1.625% convertible senior notes due 2018		7,174,013			7,165,845			7,174,013			7,165,845
0.25% convertible senior notes due 2019		3,642,200			3,638,080			3,642,200			3,638,080
1.25% convertible senior notes due 2032		2,553,025			6,290,997			5,045,404			6,290,997
Weighted average diluted shares outstanding		124,449,912			136,077,415			129,521,479			136,888,927
Income per common share:
Basic	$	0.84		$	1.12		$	2.43		$	2.66
Diluted	$	0.75		$	0.97		$	2.14		$	2.34