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Derivatives and Hedging Activities (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Interest Rate Swap [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Accounts Payable And Other Liabilities [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Accounts Payable And Other Liabilities [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Interest Expense [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Interest Expense [Member]
Dec. 31, 2008
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Change in value of forward equity commitment [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Change in value of forward equity commitment [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Other Assets [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Other Assets [Member]
Dec. 31, 2009
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Other Assets [Member]
Dec. 31, 2011
Secured Term Loan 2 [Member]
Dec. 31, 2011
Secured Term Loan 1 [Member]
Derivative [Line Items]                                
Debt instrument amount                             $ 35,551,000 $ 25,000,000
Expected amount of derivative related interest to be reclassified to interest expense over the next 12 months 1,695,000                              
Number of derivative instruments held         1                      
Notional amount of derivatives         60,551,000                      
Forward purchase equity commitment, shares               3,500,000                
Share repurchases, final price paid per share               $ 5.60                
Prepayment of derivative instrument                 15,576,000              
Interest rate swap floating payment rate per annum 2.50%                              
Forward contract indexed to issuers equity share settlement cash settlement value                 4,024,000              
Forward contract indexed to issuers equity share settlement shares retired                 3,974,645              
Derivative liabilities     (3,236,000) (5,280,000)                        
Derivative assets                         27,574,000      
Amount of Loss Recognized in OCI on Derivative (Effective Portion)           (835,000) (2,914,000)                  
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)           2,879,000 2,875,000                  
Amount of Gain (Loss) Recognized in Income on Derivative                   2,030,000 8,906,000 2,030,000 8,906,000 7,182,000    
Termination value   $ 3,400,000