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Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Intangible Assets [Abstract]        
Costs incurred to acquire intangible assets     $ 382 $ 1,313
Amortization expense for intangible assets 8,211 5,084 17,414 8,896
Annual estimated amortization expense, in 2014 33,517   33,517  
Annual estimated amortization expense, in 2015 24,496   24,496  
Annual estimated amortization expense, in 2016 21,784   21,784  
Annual estimated amortization expense, in 2017 18,886   18,886  
Annual estimated amortization expense, in 2018 $ 14,024   $ 14,024