Note 4 - Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(Dollars in thousands, except per share amounts)
Numerator:
Net income	$	98,994		$	112,760		$	181,614		$	185,421
Less: Net income allocated to unvested restricted stock		(408	)		(251	)		(705	)		(350	)
Net income available to common stockholders for basic earnings per common share		98,586			112,509			180,909			185,071
Effect of dilutive securities:
Interest on 1.625% convertible senior notes due 2018		94			91			468			453
Interest on 0.25% convertible senior notes due 2019		85			82			423			410
Interest on 1.25% convertible senior notes due 2032		64			62			320			310
Net income available to common stock for diluted earnings per share	$	98,829		$	112,744		$	182,120		$	186,244
Denominator:
Weighted average basic common shares outstanding		113,689,435			118,419,937			114,086,136			119,617,438
Effect of dilutive securities:
Share-based awards		821,628			583,264			868,491			575,516
1.625% convertible senior notes due 2018		7,171,943			7,163,865			7,171,943			7,163,865
0.25% convertible senior notes due 2019		3,641,157			3,637,091			3,641,157			3,637,091
1.25% convertible senior notes due 2032		6,312,249			6,283,989			6,312,249			6,283,989
Weighted average diluted shares outstanding		131,636,412			136,088,146			132,079,976			137,277,899
Income per common share:
Basic	$	0.87		$	0.95		$	1.59		$	1.55
Diluted	$	0.75		$	0.83		$	1.38		$	1.36