Shareholders' Equity (Class of Stock Disclosure) (Details) - shares	12 Months Ended
	Dec. 31, 2017	Jun. 08, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock Held, beginning balance	1,899,502
Common Stock Outstanding, beginning balance	91,752,099
Restricted share activity	124,800
Stock options exercised	(338,176)
Common stock repurchased	(222,000)
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	28,690	3,282,276
Treasury Stock Held, ending balance	1,658,526
Common Stock Outstanding, ending balance	92,021,765
Series E Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance	5,060
Stock Redeemed or Called During Period, Shares	(5,060)
Shares, ending balance	0
Series F Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance	0
Stock Issued During Period, Shares, New Issues	6,000
Shares, ending balance	6,000
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance	93,651,601
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	28,690
Shares, ending balance	93,680,291
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock Held, beginning balance	1,899,502
Restricted share activity	(124,800)
Stock options exercised	(338,176)
Common stock repurchased	(222,000)