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Acquisitions (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
Apr. 15, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
years
Dec. 31, 2010
Sep. 30, 2011
Jun. 30, 2011
Sep. 30, 2010
Jun. 30, 2010
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                
Weighted average amortization period, in years       5          
Liability for contingent consideration, current and non-current   20,002,000    20,002,000    21,253,000 23,794,000      
Liability for contingent consideration, current   6,703,000   6,703,000     2,398,000    
Undiscounted contingent consideration payments, minimum   1,900,000   1,900,000          
Undiscounted contingent consideration payments, maximum   30,700,000   30,700,000          
Gain (loss) due to change in fair value of contingent consideration   722,000    (172,000)           
Estimated indemnification contingent liabilities   13,500,000   13,500,000          
Cash paid to escrow   27,400,000   27,400,000          
Undiscounted amount of pre-acquisition contingencies 14,079,000                
Amount paid regarding pre-acquisition contingency   5,100,000   5,100,000          
Other Current Liabilities [Member]
                  
Business Acquisition [Line Items]                  
Estimated indemnification contingent liabilities   7,500,000   7,500,000          
Other Liabilities [Member]
                  
Business Acquisition [Line Items]                  
Estimated indemnification contingent liabilities   6,000,000   6,000,000          
Other Liabilities Adjustment [Member]
                  
Business Acquisition [Line Items]                  
Estimated indemnification contingent liabilities   3,900,000   3,900,000          
Other Long-Term Liabilities Adjustment [Member]
                  
Business Acquisition [Line Items]                  
Estimated indemnification contingent liabilities   (3,900,000)   (3,900,000)          
Other Current Liabilities Adjustment [Member]
                  
Business Acquisition [Line Items]                  
Estimated indemnification contingent liabilities   $ 3,600,000   $ 3,600,000