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Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2012
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Note B – Recent Accounting Pronouncements In the first quarter of 2012, we adopted Accounting Standards Updates (ASU) 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income . ASU 2011-05 eliminates the option to present other comprehensive income in the statement of changes in equity and provides the option to present the components of net income and comprehensive income in either one combined financial statement or two consecutive financial statements. We previously presented the components of comprehensive income in our Consolidated Statements of Stockholders' Equity and Comprehensive Income (now titled Consolidated Statements of Changes in Equity). In connection with this adoption we have presented the components of net income and comprehensive income in one combined financial statement, the Consolidated Statements of Comprehensive Income. The adoption of ASU 2011-05 did not affect our operating results, cash flows or financial position.