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Stockholders' Equity (Summary Of Anti-Dilutive Options Excluded) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity Note [Abstract]      
Options to purchase shares of common stock 1,273,527 847,254 704,384
Weighted-average exercise prices of options $ 54.00 $ 54.00 $ 32.05