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Shareholders' Equity (Stock-Based Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stockholders' Equity Note [Abstract]    
Stock-based compensation expense $ 5,293 $ 4,033
Less: Deferred tax benefit (1,916) (1,521)
Stock-based compensation expense, net of tax $ 3,377 $ 2,512