Note 6 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2014

Stockholders' Equity Note [Abstract]

Class of Treasury Stock [Table Text Block]

Repurchase of Equity Securities
Period	Total Number of Common Shares Repurchased		Average Price Paid Per Common Share		Total Number of Common Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Number (or Approximate Dollar Value) of Common Shares that May Yet Be Purchased Under the Plans or Programs
							(in thousands)
January 1 - 31		-		-		-	$	86,745
February 1 - 28		-		-		-	$	86,745
March 1 - 31		-		-		-	$	86,745
April 1 - 30		-		-		-	$	86,745
May 1 - 31		-		-		-	$	86,745
June 1 - 30		-		-		-	$	86,745
July 1 - 31		-		-		-	$	86,745
August 1 - 31		77,700	$	39.05		451,319	$	83,711
September 1 - 30		186,654	$	35.48		637,973	$	77,088

Schedule of Dividends Payable [Table Text Block]

	Nine Months Ended		Nine Months Ended		Quarter Ended		Quarter Ended
	September 30, 2014		September 30, 2013		September 30, 2014		September 30, 2013
Dividends Declared (in thousands)	$	19,982	$	19,821	$	6,644	$	6,634
Dividend per share	$	0.75	$	0.75	$	0.25	$	0.25