Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable	$ 13,900	$ 13,419
Allowance for Notes, Loans and Financing Receivable, Current	23,607	24,340
Allowance for Notes, Loans and Financing Receivable, Noncurrent	$ 12,014	$ 12,609
Preferred stock par value	$ 50	$ 50
Preferred stock dividend rate, per-dollar dividend	4.00%	4.00%
Preference Stock No Par Value	$ 0	$ 0
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	120,699,367	121,255,390