Note E - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
ECA [Member]
Goodwill resulting from business combinations			$ 141
Mostra [Member]
Goodwill resulting from business combinations	[1]		24,118
Goodwill, Purchase Accounting Adjustments	[1]	$ (380)
City Tech [Member]
Goodwill resulting from business combinations	[1]		19,563
Goodwill, Purchase Accounting Adjustments	[1]	(29)
Olson [Member]
Goodwill resulting from business combinations	[1]		225,117
Goodwill, Purchase Accounting Adjustments		3,410
Balance as of January 1		687,778	$ 418,839
Effect of foreign currency translation		(3,375)
Balance as of December 31		$ 687,404	$ 687,778

[1] During the year ended December 31, 2015, the Company recorded changes to goodwill representing adjustments during the measurement-period (up to one year from the date of an acquisition) related to acquisitions during the year ended December 31, 2014. These goodwill adjustments were not significant to our previously reported operating results or financial position. See further discussion of the Company’s business combinations in “Note F —Business Combinations.”