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Commitments and Contingencies (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 10, 2017
Mar. 31, 2017
Mar. 31, 2016
Jun. 24, 2016
Commitment And Contingencies [Line Items]        
Rental Expense Relating to Operating Leases   $ 9,517,000 $ 7,985,000  
Unfunded Commitments for Capital Contributions   $ 4,392,000    
PNC Bank [Member]        
Commitment And Contingencies [Line Items]        
Maximum Borrowing Capacity       $ 30,000,000
Amount Outstanding During Period $ 30,000,000      
Protego [Member]        
Commitment And Contingencies [Line Items]        
Percentage of the Return Proceeds Received Payable   90.00%    
Protego [Member] | Private Equity Funds [Member] | Discovery Fund [Member]        
Commitment And Contingencies [Line Items]        
Goodwill, Gross   $ 13,515,000