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Commitments, Guarantees, and Contingencies (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 28, 2013
Office Building [Member]
acre
Feb. 28, 2013
Columbia [Member]
Office Building [Member]
acre
Commitments And Contingencies [Line Items]          
Operating Leases, Rent Expense $ 8,480,000 $ 6,914,000 $ 6,615,000    
Letters of Credit Outstanding, Amount 662,000        
Deferred Rent Credit     1,041,000    
Area of Land       170,000 63,985
Other Commitment, Due in Next Twelve Months $ 3,582,000