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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Shares of common stock allocated by ESOP, including excess income tax benefits   58,618
Shares of common stock issued under compensation plans, including excess income tax benefits 828,529 1,290,732
Shares of common stock issued upon extinguishment of convertible senior notes   2,443,457