Note 3 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Restricted share units:
Pretax compensation expense	$	8,053	$	6,671	$	15,704	$	14,430
Tax benefit		3,068		2,542		5,983		5,498
Restricted share unit expense, net of tax	$	4,985	$	4,129	$	9,721	$	8,932
Performance share units:
Pretax compensation expense	$	2,515	$	2,139	$	4,993	$	4,254
Tax benefit		958		815		1,902		1,621
Performance share unit expense, net of tax	$	1,557	$	1,324	$	3,091	$	2,633
Stock options:
Pretax compensation expense	$	-	$	33	$	-	$	130
Tax benefit		-		13		-		50
Stock option expense, net of tax	$	-	$	20	$	-	$	80