CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Common stock, par value (in dollars per share)	$ 0.10		$ 0.10
Common stock, shares authorized (in shares)	280,000,000		280,000,000
Common stock, shares issued (in shares)	148,277,000		148,107,000
Common stock, shares outstanding (in shares)	140,274,000		140,104,000
Treasury stock shares (in shares)	8,003,000		8,003,000
Tax effect of accumulated other comprehensive income	$ 0	$ 0