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Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Intangible Assets [Abstract]    
Costs incurred to acquire intangible assets $ 210 $ 177
Amortization expense for intangible assets 9,204 3,812
Annual estimated amortization expense, in 2014 29,767  
Annual estimated amortization expense, in 2015 23,754  
Annual estimated amortization expense, in 2016 20,752  
Annual estimated amortization expense, in 2017 17,799  
Annual estimated amortization expense, in 2018 $ 13,094