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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Purchase Commitments
Future minimum commitments as of September 30, 2017, are as follows (in thousands):
Remainder of 2017
$
38,286

2018
19,702

2019
7,903

2020
5,488

2021
1,333

2022
2

 
$
72,714