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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Statement of Stockholders' Equity [Abstract]                      
Series B 6.75% convertible perpetual preferred stock, cash dividends declared per share $ 16.87us-gaap_PreferredStockDividendsPerShareDeclared $ 16.88us-gaap_PreferredStockDividendsPerShareDeclared $ 16.87us-gaap_PreferredStockDividendsPerShareDeclared $ 16.88us-gaap_PreferredStockDividendsPerShareDeclared $ 16.87us-gaap_PreferredStockDividendsPerShareDeclared $ 16.88us-gaap_PreferredStockDividendsPerShareDeclared $ 16.87us-gaap_PreferredStockDividendsPerShareDeclared $ 16.88us-gaap_PreferredStockDividendsPerShareDeclared $ 67.50us-gaap_PreferredStockDividendsPerShareDeclared $ 67.50us-gaap_PreferredStockDividendsPerShareDeclared $ 67.50us-gaap_PreferredStockDividendsPerShareDeclared
Common stock, cash dividends declared per share $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.51us-gaap_CommonStockDividendsPerShareDeclared $ 0.51us-gaap_CommonStockDividendsPerShareDeclared $ 0.51us-gaap_CommonStockDividendsPerShareDeclared $ 0.51us-gaap_CommonStockDividendsPerShareDeclared $ 0.50us-gaap_CommonStockDividendsPerShareDeclared $ 0.50us-gaap_CommonStockDividendsPerShareDeclared $ 2.06us-gaap_CommonStockDividendsPerShareDeclared $ 2.02us-gaap_CommonStockDividendsPerShareDeclared $ 1.98us-gaap_CommonStockDividendsPerShareDeclared