Quarterly report pursuant to Section 13 or 15(d)

Loans Payable and Other Borrowings (Details Textual)

v3.3.0.814
Loans Payable and Other Borrowings (Details Textual)
 9 Months Ended
Sep. 30, 2015
USD ($)
Jul. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 31, 2012
USD ($)
Line of Credit Facility [Line Items]          
Maximum borrowings outstanding $ 110,000,000        
Letters of credit outstanding 17,195,000     $ 19,489,000  
Line of credit facility, remaining borrowing capacity $ 482,800,000        
Notes Payable, Other Payables [Member]          
Line of Credit Facility [Line Items]          
Interest rate, minimum (percentage) 0.00%        
Interest rate, maximum (percentage) 6.00%        
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Line Items]          
Description of variable rate basis LIBOR        
Base rate (percentage) 0.19%        
Basis spread on variable rate (percentage) 1.75%        
Revolving Credit Facility [Member] | Prime Rate [Member]          
Line of Credit Facility [Line Items]          
Description of variable rate basis Prime        
Base rate (percentage) 3.25%        
Basis spread on variable rate (percentage) 0.75%        
Revolving Credit Facility [Member] | Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 500,000,000 $ 600,000,000 $ 500,000,000   $ 125,000,000
Line of credit facility, accordion feature, increase limit   $ 100,000,000      
Minimum tangible net worth $ 670,300,000        
Leverage ratio (as a percentage) 0.6        
Interest coverage ratio 1.5