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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule Of Noncancellable Minimum Commitments The aggregate noncancellable minimum commitments at December 31, 2017 are: 
2018
$
10,046

2019
9,427

2020
7,413

2021
7,082

2022 and thereafter
29,171

 
$
63,139