Discontinued Operations (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations, net of income taxes	$ 0	$ 5,786,000
CES [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations, net of income taxes		8,000,000
Alcadon [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations, net of income taxes		800,000
Amount of intercompany revenue that was previously eliminated from financial statements in consolidation		1,100,000
Interdata [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations, net of income taxes		(1,000,000)
Pedrena [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of intercompany revenue that was previously eliminated from financial statements in consolidation		$ 1,300,000