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Revenue (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Contract Balances, Opening and Closing Balances
The following table summarizes the opening and closing balances of the Company's receivables; contract asset, current; contract asset, non-current; deferred revenue, current; and deferred revenue, non-current (in thousands):
 
Receivables
 
Contract asset, current
 
Contract asset, non-current
 
Deferred revenue, current
 
Deferred revenue, non-current
Beginning balances as of January 1, 2018 (1)
$
576,313

 
$
9,002

 
$
16,186

 
$
71,085

 
$
53,101

Closing balances as of June 30, 2018
616,472

 
9,748

 
16,010

 
80,464

 
48,863

Increase/(decrease)
$
40,159

 
$
746

 
$
(176
)
 
$
9,379

 
$
(4,238
)
 
(1) 
Includes cumulative adjustments made to these accounts on January 1, 2018 from the adoption of Topic 606.