Business Segments and Customer Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Segment Information

Our segment information is as follows (in thousands):

For the years ended December 31,
	2018			2017			2016
Revenues
Supply Chain Management Group	$	214,809		$	214,542		$	205,475
Aviation Group	145,423			134,809			133,466
Federal Services Group	336,986			410,762			352,849
Total revenues	$	697,218		$	760,113		$	691,790
Operating income:
Supply Chain Management Group	$	30,626		$	33,754		$	34,632
Aviation Group	11,076			9,695			12,823
Federal Services Group	15,797			13,419			7,796
Corporate expenses	(3,269		)	(2,543		)	(3,722		)
Operating income	$	54,230		$	54,325		$	51,529
Depreciation and amortization expense:
Supply Chain Management Group	$	7,299		$	6,536		$	6,445
Aviation Group	5,123			4,835			5,461
Federal Services Group	12,802			14,511			14,140
Total depreciation and amortization	$	25,224		$	25,882		$	26,046
Capital expenditures:
Supply Chain Management Group	$	802		$	1,376		$	4,195
Aviation Group	1,772			1,387			1,459
Federal Services Group	209			177			94
Corporate	334			373			1,624
Total capital expenditures	$	3,117		$	3,313		$	7,372

	December 31,
	2018		2017
Total assets:
Supply Chain Management Group	$	166,015	$	176,860
Aviation Group	316,197		282,738
Federal Services Group	92,098		102,372
Corporate	64,518		67,043
Total assets	$	638,828	$	629,013

Revenue by Customer

Our revenue by customer is as follows for the years ended December 31, (in thousands):

	Revenues by Customer Years ended December 31,
Customer	2018		%	2017		%	2016		%
USPS	$	175,339	25.1	$	180,205	23.7	$	181,215	26.2
U.S. Navy	160,952		23.1	206,644		27.2	190,155		27.5
U.S. Army	156,519		22.5	188,462		24.8	139,764		20.2
U.S. Air Force	17,023		2.4	7,123		0.9	3,482		0.5
Total - DoD	334,494		48.0	402,229		52.9	333,401		48.2
Commercial Aviation	135,864		19.5	126,960		16.7	131,067		19.0
Other Commercial	14,742		2.1	12,498		1.7	10,721		1.5
Total - Commercial	150,606		21.6	139,458		18.4	141,788		20.5
Other Government	36,779		5.3	38,221		5.0	35,386		5.1
Total	$	697,218	100.0	$	760,113	100.0	$	691,790	100.0

Revenue by Geographic Areas

Revenue by geography is based on the billing address of the customer. Our revenue by geographic area is as follows (in thousands):

	Years ended December 31,
	2018		2017		2016
United States	$	647,168	$	708,474	$	638,726
Other Countries (1)	50,050		51,639		53,064
Total revenue	$	697,218	$	760,113	$	691,790

(1) No individual country, other than disclosed above, exceeded 10% of our total revenue for any period presented.