Annual report pursuant to Section 13 and 15(d)

Interest Rate Swap (Details)

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Interest Rate Swap (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
May 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Interest Rate Swap [Abstract]      
Notional amount of interest rate swap agreements $ 250,000    
Interest rate swap agreements expire date   June 1, 2017  
Interest rate received in swap agreements 5.75%    
Interest rate paid on swap agreements three month LIBOR plus 3.5%    
Variable interest rate   3.74%  
Fair value of swap agreements   $ 9,576 $ 16,304