Discontinued Operations - Income Statement and Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Provision (benefit) for income taxes			$ 0	$ 889
Net income (loss) from discontinued operations, net of income taxes	0	(2,097)	7,975	(741)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total current assets	0		0		24,810
CES [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue			6,829	17,757
Income (loss) before income taxes			(135)	3,484
Provision (benefit) for income taxes			500	869
Income from operations of discontinued operations			(135)	2,615
Net income (loss) from discontinued operations, net of income taxes			(135)	2,615
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Cash and cash equivalents					12,364
Time deposits					1,281
Accounts receivable, net					5,310
Inventories					4,029
Other current assets					1,826
Total current assets					24,810
Property and equipment, net					2,571
Goodwill					12,843
Other assets					(119)
Total assets					40,105
Accounts payable					705
Accrued liabilities					1,802
Other current liabilities					729
Non-current liabilities					467
Total liabilities					$ 3,703