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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Intangible Assets [Abstract]        
Costs incurred to acquire intangible assets $ 357 $ 172 $ 560 $ 382
Amortization expense for intangible assets 17,481 $ 8,211 31,997 $ 17,414
Annual estimated amortization expense, in 2015 61,040   61,040  
Annual estimated amortization expense, in 2016 54,704   54,704  
Annual estimated amortization expense, in 2017 47,189   47,189  
Annual estimated amortization expense, in 2018 39,046   39,046  
Annual estimated amortization expense, in 2019 $ 28,471   $ 28,471