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Special Cash Dividend (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2013
May 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 21, 2013
Special Cash Dividend [Abstract]              
Dividends declared per share (in dollars per share) $ 5.00 $ 6.00 $ 0 $ 0 $ 5.00 $ 6.00  
Cash dividends paid         $ 340,772    
Dividends declared but unpaid     1,322   1,322    
Retained earnings as of the dividend declaration date             $ 4,934