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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Annual Rental Commitments Under Non-Cancelable Operating Leases
Future minimum lease payments under operating leases were as follows:
 
 
 
Year ending December 31,
 
December 31, 2016
 
 
(in thousands)

2017
 
$
68,241

2018
 
56,125

2019
 
42,702

2020
 
35,692

2021
 
29,230

Thereafter
 
78,565

Total minimum lease payments
 
$
310,555

Operating Lease Rental Expense
Rent expense under operating leases was:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(in thousands)
Minimum rentals
$
88,182

 
$
96,579

 
$
108,466

Contingent rentals
14,596

 
14,929

 
16,875

Less: Sublease rentals
(187
)
 
(322
)
 
(868
)
Total rent expense
$
102,591

 
$
111,186

 
$
124,473