Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities
Net income before noncontrolling interests	$ 5,710	$ 13,732
Adjustments to reconcile net income before noncontrolling interests to net cash provided by operating activities:
Net income from discontinued operations	(822)	(101)
Depreciation and amortization	13,091	9,401
Stock-based compensation	1,658	1,894
Changes in assets and liabilities:
Increase in receivables	(666)	(6,796)
Decrease in unbilled revenues	4,627	561
Decrease in other net assets	38	1,612
Decrease in accounts payable	(4,917)	(6,499)
Increase/(decrease) in billings in excess of revenues	523	(2,210)
Increase in accrued expenses	2,531	4,590
Net cash provided by continuing operations	21,773	16,184
Net cash used in discontinued operations	(86)	(704)
Net cash provided by operating activities	21,687	15,480
Cash Flows from Investing Activities
Additions to property, plant and equipment	(2,030)	(2,851)
Cash portion of acquisitions	(1,000)	(3,134)
Purchase of available-for-sale securities	(801)	(9,046)
Sale of available-for-sale securities	13,130	4,308
Proceeds from sale of fixed assets	30
Net cash provided by/(used in) investing activities	9,329	(10,723)
Cash Flows from Financing Activities
Proceeds from employee stock purchases and exercise of stock options	816	839
Payments on capital lease obligations		(143)
Treasury stock purchases	(272)	(86)
Noncontrolling interest distributions	(555)	(865)
Net cash used in financing activities	(11)	(255)
Net increase in cash and cash equivalents	31,005	4,502
Cash and cash equivalents, beginning of period	36,050	77,443
Cash and cash equivalents, end of period	$ 67,055	$ 81,945