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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Intangible Assets [Abstract]        
Amortization expense $ 8,857 $ 15,843 $ 26,536 $ 47,840
Annual amortization expense in 2016 35,193   35,193  
Annual amortization expense in 2017 32,143   32,143  
Annual amortization expense in 2018 26,971   26,971  
Annual amortization expense in 2019 21,635   21,635  
Annual amortization expense in 2020 $ 16,941   $ 16,941