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Derivatives and Hedging Activities (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Interest Rate Swap [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Accounts Payable And Other Liabilities [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Accounts Payable And Other Liabilities [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
derivative_instrument
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Interest Expense [Member]
Dec. 31, 2011
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]
Oct. 31, 2011
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Dec. 31, 2012
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]
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, 2012
Secured Term Loan [Member]
Dec. 31, 2012
Secured Term Loan 2 [Member]
Dec. 31, 2012
Secured Term Loan 1 [Member]
Derivative [Line Items]                                
Derivative Instrument, Settlement Amount   $ 3,539,000                            
Debt instrument amount                           255,000,000 35,551,000 25,000,000
Expected amount of derivative related interest to be reclassified to interest expense over the next 12 months 2,759,000                              
Number of derivative instruments held         5                      
Notional amount of derivatives         255,000,000                      
Forward purchase equity commitment, shares               3,500,000                
Share repurchases, final price paid per share               $ 5.60                
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     (6,556,000) (3,236,000)                        
Amount of Loss Recognized in OCI on Derivative (Effective Portion)           (8,886,000) (835,000)                  
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)   1,837,000       724,000 2,879,000                  
Amount of Gain (Loss) Recognized in Income on Derivative                   $ 0 $ 2,030,000 $ 2,030,000 $ 8,906,000