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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue Recognition from Contracts with Customers [Abstract]  
Contract with Customer, Asset and Liability [Table Text Block]
The Company’s contract balances were as follows:
 
As of
(In thousands)
June 30, 2018
 
January 1, 2018
Unbilled receivables
$
750,875

 
$
818,371

Deferred revenue
13,900

 
20,737