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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Future Minimum Lease Payments Under Non-cancelable Operating and Capital Leases
Future minimum lease payments under non-cancellable operating and capital leases are as follows: 
 
Operating
leases
 
Capital
leases
2018
$
446,935

 
$
35,258

2019
422,245

 
36,038

2020
384,764

 
36,689

2021
351,962

 
32,578

2022
313,005

 
33,004

Thereafter
1,303,594

 
234,094

 
$
3,222,505

 
407,661

Less portion representing interest
 
 
(110,491
)
Total capital lease obligations, including current portion
 
 
$
297,170