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Commitments (Tables)
12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Commitments under Non-cancelable Operating Leases
We lease certain of our premises and equipment under non-cancelable operating leases with terms expiring through 2019 exclusive of renewal option periods. Our annual aggregate minimum rental commitments under these leases are summarized as follows:
2015
$
20,423

2016
19,637

2017
12,599

2018
5,822

2019
1,359

Thereafter

 
59,840

Less: Sublease income
(8,863
)
Total minimum lease payments, net
$
50,977