Aircraft Support Parts, net
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Aircraft Support Parts, net
AIRCRAFT SUPPORT PARTS, NET

Aircraft support parts, net consisted of the following (in thousands):

 
As of December 31,
 
2015
 
2014
Aircraft parts
$
134,410

 
$
124,629

Work-in-process
10,405

 
18,604

 
144,815

 
143,233

Less: excess and obsolete reserve
(5,206
)
 
(5,640
)

$
139,609

 
$
137,593



Activity for the excess and obsolete reserve was as follows (in thousands):

 
Years Ended December 31,

2015
 
2014
 
2013
Balance at beginning of year
$
(5,640
)
 
$
(6,000
)
 
$
(6,060
)
Increase in reserves
(830
)
 
(117
)
 
(585
)
Amounts written off
1,264

 
477

 
645

Balance at end of year
$
(5,206
)
 
$
(5,640
)
 
$
(6,000
)