Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Stock Options (Summary of Stock Options Outstanding) (Details)

v2.4.0.8
Stock Options (Summary of Stock Options Outstanding) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
$2.21 - $7.82 [Member]
Dec. 31, 2013
$9.30 - $18.26 [Member]
Dec. 31, 2013
$18.78 - $74.95 [Member]
Dec. 31, 2013
$82.15 - $120.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                
Range of Exercise Prices (Lower)         $ 2.21 $ 9.30 $ 18.78 $ 82.15
Range of Exercise Prices (Upper)         $ 7.82 $ 18.26 $ 74.95 $ 120.51
Options Outstanding, Number Outstanding 2,007,433 3,315,917 1,037,267 1,182,650 773,770 508,832 370,179 354,652
Options Outstanding, Weighted-Average Remaining Contractual Life in Years         4 years 3 months 18 days 3 years 6 months 4 years 7 months 6 days 9 years 6 months
Options Outstanding, Weighted-Average Exercise Price $ 29.66 $ 11.84 $ 18.59 $ 15.16 $ 5.94 $ 15.40 $ 43.63 $ 87.27
Options Exercisable, Number Exercisable 1,013,848 2,281,298 210,520   618,965 269,989 124,894 0
Options Exercisable, Weighted-Average Exercise Price $ 11.36 $ 7.32 $ 16.44   $ 5.53 $ 15.19 $ 31.97