Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred income tax assets:
Accrued expenses	$ 11,417	$ 3,701
Allowance accounts	5,057	3,900
Inventory	302	457
Total current deferred income tax asset	16,776	8,058
Valuation allowance	(10,454)	(6,148)
Net current deferred income tax asset	6,322	1,910
Deferred income tax liabilities:
Unbilled receivables	(26,863)	(7,592)
Net current deferred income tax (liability) asset	(20,541)	(5,682)
Deferred income tax assets:
Net operating loss carryforward	7,227	6,598
Capital loss carryforward	19,919	19,005
Equity method investment	33,305	33,409
Cost method investments	4,037	3,843
Basis in identified intangibles	4,852	3,606
Basis in research and development	3,196	2,045
Basis in property, plant and equipment	(2,387)	1,234
Tax credit carryforwards and other	10,387	10,386
Total non-current deferred income tax asset	80,536	80,126
Valuation allowance	(52,807)	(63,327)
Net non-current deferred income tax asset (liability)	$ 27,729	$ 16,799