CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance (in dollars)	$ 4,565	$ 5,127
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	505,221,643	477,496,499
Common stock, shares outstanding	505,221,643	477,496,499