Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Statement Of Financial Position [Abstract]
Preferred stock, stated value	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	0	28,000	28,000
Preferred stock, shares outstanding	0	28,000	28,000
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	28,155,317	26,461,769	25,257,669
Treasury stock, shares	1,383,496	1,363,342	1,363,342