Annual report pursuant to Section 13 and 15(d)

Derivatives (Details)

v2.4.0.8
Derivatives (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Interest rate swaps (Swaps)
Not designated as hedge
item
Dec. 31, 2013
Interest rate swaps (Swaps)
Cash flow hedge
item
Dec. 31, 2012
Interest rate swaps (Swaps)
Cash flow hedge
Dec. 31, 2013
1.884 % interest rate swaps
Dec. 31, 2013
1.384 % interest rate swaps
Dec. 31, 2013
1.959 % interest rate swaps
Dec. 31, 2013
1.850 % interest rate swaps
Dec. 31, 2011
Interest rate cap
Not designated as hedge
item
Dec. 31, 2011
Interest rate floor
Not designated as hedge
Derivatives                        
Number of derivative financial instruments, asset         1           1  
Aggregate fair value of an asset         $ 2,495,000 $ 116,000         $ 25,000  
Number of derivative financial instruments, liability       3 3              
Aggregate fair value of an liability       16,959,000 2,013,000 12,359,000           19,320,000
Amount in Accumulated OCL expected to recognize in interest expense in coming 12 months         5,044,000              
Derivative instruments amounts offset 0 0 0                  
Notional             $ 540,375,000 $ 143,187,500 $ 111,934,673 $ 111,934,673    
Rate Paid (as a percent)             1.884% 1.384% 1.959% 1.85%    
Variable interest rate base             3 mo.USD-LIBOR-BBA 3 mo.USD-LIBOR-BBA 3 mo.USD-LIBOR-BBA 3 mo.USD-LIBOR-BBA    
Variable interest rate base floor             1.00% 1.00% 1.00% 1.00%