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Dividends Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended 12 Months Ended 0 Months Ended
Jun. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 13, 2013
Dividend Declared [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]          
Cash dividend declared (in dollars per share)    $ 0.30 $ 0.20   $ 0.345
Payment of cash dividends   $ 70,514 $ 48,374 $ 36,638  
Date dividend to be paid         Mar. 26, 2014
Date of record of stockholders to whom dividends will be paid         Mar. 14, 2014