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Share-Based Compensation (Summarized Information of Stock Options Outstanding) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
$6.07 - 23.50
Dec. 31, 2013
$6.07 - 23.50
Dec. 31, 2012
$6.07 - 23.50
Sep. 30, 2013
$3.68 - 17.50
Dec. 31, 2012
$3.68 - 17.50
Sep. 30, 2013
$2.41 - 16.11
Dec. 31, 2011
$2.41 - 16.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]              
Exercise price range - lower range (in dollars per share)   $ 6.07   $ 6.07     $ 6.07
Exercise price range - upper range (in dollars per share)   $ 23.50   $ 23.50     $ 23.50
Outstanding:              
Weighted average remaining contractual life (years)   6 years 6 months     6 years 3 months   6 years 0 months
Aggregate intrinsic value   $ 30,599     $ 26,472   $ 19,639
Exercisable:              
Number of shares   922     1,040   1,383
Weighted average remaining contractual life (years)   4 years 6 months     4 years 2 months   3 years 11 months
Aggregate intrinsic value   15,053 13,934       13,925
Exercised:              
Aggregate intrinsic value $ 9,139     $ 10,465   $ 5,059