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Note 6 - Capital Stock	3 Months Ended
	Mar. 31, 2017
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	6.     Capital Stock On October 22, 2015, our Board of Directors authorized the purchase of $500 million of our common stock, of which $71 million was remaining at March 31, 2017. We purchased approximately 1,328,000 shares, or $129.8 million, of our common stock under our repurchase authorization during the three months ended March 31, 2017. On April 20, 2017 our Board of Directors authorized an additional purchase of up to $500 million of our common stock.  On January 25, 2017, we announced an increase in our quarterly cash dividend from $0.22 to $0.23, which was paid February 24, 2017 , to stockholders of record on February 10, 2017 . On April 20, 2017, our Board of Directors declared a regular quarterly dividend of $0.23 per common share, which will be paid on May 19, 2017 , to stockholders of record on May 5, 2017 .

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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