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Revised Financial Statements (Details 3) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Net cash provided (used) by:    
Operating activities $ 89,102 $ 185,290
Investing activities $ (103,226) (150,829)
As Previously Reported    
Net cash provided (used) by:    
Operating activities   184,409
Investing activities   (149,948)
Revision    
Net cash provided (used) by:    
Operating activities   881
Investing activities   $ (881)