Note 3 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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,
	2014		2013		2014		2013
Restricted share units:
Pretax compensation expense	$	6,671	$	7,094	$	14,430	$	14,297
Tax benefit		2,542		2,699		5,498		5,440
Restricted share unit expense, net of tax	$	4,129	$	4,395	$	8,932	$	8,857
Performance share units:
Pretax compensation expense	$	2,139	$	1,588	$	4,254	$	3,159
Tax benefit		815		604		1,621		1,202
Performance share unit expense, net of tax	$	1,324	$	984	$	2,633	$	1,957
Stock options:
Pretax compensation expense	$	33	$	158	$	130	$	521
Tax benefit		13		60		50		198
Stock option expense, net of tax	$	20	$	98	$	80	$	323