Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Other Intangible Assets [Abstract]

Changes in the carrying amount of goodwill

	2012		2011
Balance as of January 1	$	401,134	$	323,467
Goodwill resulting from the Marbek business combination		—		2,381
Goodwill resulting from the AeroStrategy business combination		—		1,026
Goodwill resulting from the Ironworks business combination		119		74,260
Goodwill resulting from the GHK business combination		7,857		—
Goodwill resulting from the Symbiotic Engineering business combination		1,473		—
Balance as of December 31	$	410,583	$	401,134

Components of other intangible assets

	2012			2011
Customer-related intangibles	$	58,204		$	57,933
Developed technology		3,237			2,352
Marketing trade name		814			605
		62,255			60,890
Less: accumulated amortization		(41,239	)		(27,150	)
	$	21,016		$	33,740

Estimated future amortization expense related to intangible assets

Year ending December 31,
2013	$	9,464
2014		5,400
2015		2,785
2016		1,643
2017		995
Thereafter		729
	$	21,016