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Acquisitions (Narrative) (Details) (USD $)
0 Months Ended
Apr. 15, 2011
Mar. 31, 2012
Other Current Liabilities [Member]
Mar. 31, 2012
Other Long-Term Liabilities [Member]
Mar. 31, 2012
Maximum [Member]
Business Acquisition [Line Items]        
Percentage of company equity acquired 100.00%      
Name of company acquisition CDC      
Initial payment for cash share purchase $ 36,228,000      
Estimated indemnification contingent liabilities   $ 4,300,000 $ 7,100,000 $ 15,000,000