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Permanent Equity (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Member]
Jun. 30, 2013
Additional paid-in capital [Member]
Jun. 30, 2012
Additional paid-in capital [Member]
Jun. 30, 2013
Non-controlling Interest [Member]
Jun. 30, 2012
Non-controlling Interest [Member]
Jun. 30, 2013
JVB [Member]
Restricted Stock [Member]
Dec. 31, 2011
JVB [Member]
Restricted Stock [Member]
Permanent Equity [Line Items]                      
Acquisition / (surrender) of additional units of consolidated subsidiary, net       $ 25 $ 28 $ (634) $ (828) $ 609 $ 800    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   186,342 372,681                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                     559,020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                   186,339  
Shares issued in connection with the redemption of Operating LLC units 556,736                    
Issuance of common stock 186,339                 186,339