Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable	$ 12,680	$ 10,742
Allowance for Notes, Loans and Financing Receivable, Current	16,143	19,108
Allowance for Notes, Loans and Financing Receivable, Noncurrent	$ 6,551	$ 9,002
Preferred stock par value (in dollars per share)	$ 50	$ 50
Preferred stock dividend rate	4.00%	4.00%
Preference stock dividend rate (in dollars per share)	$ 2.12	$ 2.12
Common stock, par value (in dollars per share)	$ 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	126,300,691	122,309,948