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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Purchase Commitments
Future minimum commitments as of June 30, 2017, are as follows (in thousands):
Remainder of 2017
$
40,542

2018
16,706

2019
7,188

2020
3,624

2021
1,654

2022
3

 
$
69,717