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Stockholders' Equity and Equity Compensation Plans (Details) (Restricted common stock, USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Restricted common stock
   
Shares    
Shares, Unvested awards, beginning balance 1,848 1,922
Shares, Awards granted 18 650
Shares, Awards forfeited/cancelled (21) (51)
Shares, Awards vested (13) (689)
Shares, Unvested awards, ending balance 1,832 1,832
Weighted average grant date fair value    
Weighted-Average Grant Date Fair Value, Unvested awards, beginning balance $ 21.21 $ 18.57
Weighted-Average Grant Date Fair Value, Awards granted $ 25.09 $ 26.28
Weighted-Average Grant Date Fair Value, Awards forfeited/cancelled $ 20.12 $ 20.32
Weighted-Average Grant Date Fair Value, Awards vested $ 21.03 $ 18.52
Weighted-Average Grant Date Fair Value, Unvested awards, ending balance $ 21.27 $ 21.27