Note E - Goodwill and Other Intangible Assets (Details) - Changes in Carrying Amount of Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012	Nov. 05, 2014
Goodwill [Line Items]
Balance as of January 1			$ 410,583
Balance as of December 31	418,839	687,778	410,583
GHK [Member]
Goodwill [Line Items]
Goodwill resulting from business combination	(101)
ECA [Member]
Goodwill [Line Items]
Goodwill resulting from business combination	8,357	141
Mostra [Member]
Goodwill [Line Items]
Goodwill resulting from business combination		24,118
CityTech [Member]
Goodwill [Line Items]
Goodwill resulting from business combination		19,563
Olson [Member]
Goodwill [Line Items]
Balance as of January 1				225,100
Goodwill resulting from business combination		225,117
Balance as of December 31		$ 225,117		$ 225,100