Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	280,000	280,000
Common stock, shares issued	143,817	143,352
Common stock, shares outstanding	143,817	143,352
Tax effect of accumulated other comprehensive income	$ 0	$ 4