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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 28, 2016
Subsequent Event [Line Items]          
Dividends paid   $ 104,628 $ 104,840 $ 102,515  
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Dividends declared per share to shareholders         $ 0.25
Dividends paid $ 26,000