Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	May 01, 2013	Apr. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.001			$ 0.001
Common stock, shares authorized	150,000,000	150,000,000	80,000,000	150,000,000
Common stock, shares outstanding	45,871,000			46,762,000
Preferred stock, par value	$ 0.001			$ 0.001
Preferred stock, shares authorized	20,000,000			20,000,000
Preferred stock, shares issued	0			0
Preferred stock, shares outstanding	0			0
Treasury stock, shares				111,000