Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common Stock [Member] | Series A Warrants [Member]
Exercise of warrants into shares of common stock		2,315	427,905
Exercise of warrants into shares of common stock		904	169,543
Retained Earnings [Member]
Common stock per share dividend amount	$ 2.80	$ 2.80	$ 2.80
Treasury Stock [Member] | Series A Warrants [Member]
Exercise of warrants into shares of common stock	87,381
Exercise of warrants into shares of common stock	41,439