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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 12, 2016
May 19, 2016
Feb. 23, 2016
Jun. 30, 2016
Jun. 30, 2015
Shareholders' Equity          
Common stock dividend declared (in dollars per share) $ 0.39        
Common stock dividends payable $ 92,619        
Distribution to common shareholders (in dollars per share)   $ 0.39 $ 0.39    
Distribution to common shareholders   $ 92,614 $ 92,614 $ 185,228 $ 171,185