Preferred Stock (Details) (USD $)	0 Months Ended
	Mar. 18, 2009 item	Sep. 30, 2014	Dec. 31, 2013	Mar. 18, 2009
Preferred Stock
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock	1
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01	$ 0.01
Number of shares of Series A Junior Participating Preferred Stock that each right entitles the registered holder to purchase				0.001
Par value of Series A Junior Participating Preferred Stock (in dollars per share)		$ 0.01	$ 0.01	$ 0.01
Purchase price of Series A Junior Participating Preferred Stock (in dollars per one one-thousandth of a share)				$ 25