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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) [Abstract]        
Depreciation and amortization $ 148,120 $ 169,855 $ 571,059 $ 296,583
Non-cash stock-based compensation expense $ 10,147 $ 7,869 $ 25,871 $ 23,170