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Income Taxes (loss from operations before income tax expense by jurisdiction) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net loss $ (78,806) $ (33,120) $ (20,641) $ (24,370) $ (31,546) $ (19,727) $ (17,864) $ (13,810) $ (156,937) $ (82,947) $ (51,983)
Domestic Tax Authority [Member]                      
Net loss                 (150,227) (76,742) (48,691)
Foreign Tax Authority [Member]                      
Net loss                 $ (6,710) $ (6,205) $ (3,292)