Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable	$ 10,056	$ 9,262
Allowance for Notes, Loans and Financing Receivable, Current	14,196	15,514
Allowance for Notes, Loans and Financing Receivable, Noncurrent	$ 5,584	$ 6,249
Preferred stock par value (in dollars per share)	$ 50	$ 50
Preferred stock dividend rate	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	131,097,268	127,816,704