Capital Stock Capital Stock (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Capital Stock
Authorized shares of capital stock	105,000,000
Authorized shares of common stock	100,000,000	100,000,000
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Authorized shares of preferred stock	5,000,000	5,000,000
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock reserved for future issuance (shares)	655,000
Shares under the 2009 Stock Incentive Plan
Capital Stock
Common stock reserved for future issuance (shares)	525,000
Shares under the Employee Stock Purchase Plan
Capital Stock
Common stock reserved for future issuance (shares)	130,000