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Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common stock per share dividend amount $ 2.80 $ 2.80 $ 2.80
Common Stock [Member] | Series C Stock Warrants [Member]      
Exercise of warrants into shares of common stock     407,542
Exercise of warrants into shares of common stock     186,589
Common Stock [Member] | Series A Warrants [Member]      
Exercise of warrants into shares of common stock 2,315 427,905 69,127
Exercise of warrants into shares of common stock 904 169,543 25,427
Retained Earnings [Member]      
Common stock per share dividend amount $ 2.80 $ 2.80 $ 2.80