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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Intangible Assets [Abstract]        
Costs incurred to acquire intangible assets $ 159 $ 165 $ 719 $ 547
Amortization expense for intangible assets 15,843 $ 11,096 47,840 $ 28,510
Annual estimated amortization expense, in 2015 67,617   67,617  
Annual estimated amortization expense, in 2016 54,739   54,739  
Annual estimated amortization expense, in 2017 47,227   47,227  
Annual estimated amortization expense, in 2018 39,083   39,083  
Annual estimated amortization expense, in 2019 $ 28,466   $ 28,466