CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Investments measured at fair value	$ 50.6	$ 48.5
LIABILITIES AND SHAREHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	25,821,000	25,807,000
Common stock, shares outstanding (in shares)	22,747,000	22,734,000
Treasury stock, common shares held (in shares)	3,073,000	3,073,000