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Intangible Assets
 6 Months Ended
Jun. 30, 2019
Intangible Assets
3.    Intangible Assets
  
Intangible Assets, Net consists of the following:
                                                               
 
June 30,
 
December 31,
 
 
2019
 
2018
 
Finite-Lived Intangible Assets / Contractual Rights
  $
1,712,576
    $
1,712,576
 
Accumulated Amortization
   
(1,279,569
 )    
(1,244,069
 )
                 
Intangible Assets, Net
  $
433,007
    $
468,507
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
Amortization expense associated with Blackstone’s intangible assets was $17.7 million and $35.5 million for the three and six month periods ended June 30, 2019, respectively, and $14.5 million and $29.0 million for the three and six month periods ended June 30, 2018, respectively.
Amortization of Intangible Assets held at June 30, 2019 is expected to be $71.0 million, $71.0 million, $71.0 million, $63.3 million, and $34.3 million for each of the years ending December 31, 2019, 2020, 2021, 2022 and 2023, respectively. Blackstone’s intangible assets as of June 30, 2019 are expected to amortize over a weighted-average period of 8.2 years.