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Shareholders' Equity (Details 3) (Unvested Restricted Stock, USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Unvested Restricted Stock
        
Unvested Restricted Stock Outstanding        
Balance at the beginning of the period (in shares) 1,100 446 386  
Granted (in shares) 342 798 353  
Vested (in shares) (43) (128) (284)  
Forfeited (in shares) (25) (16) (9)  
Balance at the end of the period (in shares) 1,374 1,100 446 386
Balance at the beginning of the period (in dollars per share) $ 39.38 $ 34.07 $ 20.84  
Granted (in dollars per share) $ 41.83 $ 40.19 $ 37.40  
Vested (in dollars per share) $ 37.00 $ 26.26 $ 20.49  
Forfeited (in dollars per share) $ 38.89 $ 37.24 $ 26.45  
Balance at the end of the period (in dollars per share) $ 40.07 $ 39.38 $ 34.07 $ 20.84
Aggregate Intrinsic Value $ 59,307,000 $ 45,295,000 $ 18,707,000 $ 13,991,000
Weighted Average Remaining Vesting Term 2 years 8 months 12 days 3 years 4 months 24 days 2 years 2 months 12 days 7 months 6 days
Aggregate value of awards vested $ 1,700,000 $ 5,300,000 $ 10,600,000