CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Balance Sheet Parenthetical Disclosures
Accounts receivable, allowance (in dollars)	$ 4,312	$ 4,459
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	469,034,877	468,081,489
Common stock, shares outstanding	469,034,877	468,081,489