CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands, shares in Millions	Mar. 31, 2016	Dec. 31, 2015
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts and notes receivable, allowance for doubtful accounts (in dollars)	$ 2,972	$ 2,710
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	199.0	199.0
Common stock, shares issued	66.9	66.7
Treasury stock, shares	4.0	4.2