Consolidated Balance Sheets Stockholders' Equity - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value	$ 0.625	$ 0.625
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	66,382,798	65,782,041
Repurchased common stock, shares	9,150,795	8,112,141