CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
EQUITY
Common stock, shares authorized (in shares)	40,000,000.0	40,000,000.0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued (in shares)	24,500,000	24,500,000
Common stock, shares outstanding (in shares)	24,300,000	24,300,000