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Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property and equipment, to be held and used, is summarized as follows (in thousands):
 
 
September 30,
2017
 
December 31,
2016
Flight equipment
$
1,689,027

 
$
1,541,872

Ground equipment
51,209

 
49,229

Leasehold improvements, facilities and office equipment
27,385

 
27,364

Aircraft modifications and projects in progress
157,251

 
113,518

 
1,924,872

 
1,731,983

Accumulated depreciation
(813,671
)
 
(730,991
)
Property and equipment, net
$
1,111,201

 
$
1,000,992