Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable	$ 15,528	$ 20,219
Allowance for Notes, Loans and Financing Receivable, Current	26,277	25,484
Allowance for Notes, Loans and Financing Receivable, Noncurrent	$ 9,824	$ 14,610
Preferred stock par value	$ 50	$ 50
Preferred stock dividend rate, per-dollar dividend	4.00%	4.00%
Preference Stock No Par Value
Preference stock dividend rate, in dollars per share	$ 2.12	$ 2.12
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	480,000,000	480,000,000
Common stock, shares issued	323,337,912	323,337,912
Treasury stock, shares	121,534,452,000	122,453,865,000