Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Restricted Stock Activity) (Details)

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Stockholders' Equity (Restricted Stock Activity) (Details) (Restricted Stock, USD $)
3 Months Ended
Mar. 31, 2014
Restricted Stock
 
Shares:  
Nonvested, Beginning 115,386
Granted 29,950
Vested (42,607)
Cancelled (3,452)
Nonvested, Ending 99,277
Weighted- Average Grant Date Fair Value  
Nonvested, Beginning (in usd per share) $ 21.93
Granted (in usd per share) $ 74.42
Vested (in usd per share) $ 17.88
Canceled (in usd per share) $ 18.32
Nonvested, Ending (in usd per share) $ 39.63