Stockholder's Equity (Details) - shares	Mar. 31, 2016	Dec. 31, 2015
Preferred Stock:
Authorized shares	50,000,000	50,000,000
Issued shares	25,875,000	25,875,000
Outstanding shares	25,875,000	25,875,000
Common Stock, $1.00 par value:
Authorized shares	700,000,000	700,000,000
Issued shares	357,697,257	355,594,373
Outstanding shares	356,772,720	354,777,670