Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies- Derivative Financial Instruments (Details)

v2.4.0.8
Summary of Significant Accounting Policies- Derivative Financial Instruments (Details) (Interest rate swap instruments, USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2007
contract
Dec. 31, 2007
Interest Rate Swap Contract 1
Dec. 31, 2007
Interest Rate Swap Contract 2
Mar. 31, 2010
Interest Rate Swap Contract 3
Jul. 31, 2011
Interest Rate Swap Contract 4
Oct. 31, 2012
Interest Rate Swap Contract 5
swap
Sep. 30, 2013
Interest Rate Swap Contract 5
Oct. 31, 2012
Interest Rate Swap Contract 6
swap
Derivative [Line Items]                
Number of instruments held (contracts) 2         2   2
Term of interest rate swap contract 15 years     14 years 5 years 8 years   8 years
Initial notional amount of interest rate swaps   $ 13,081 $ 3,256 $ 27,900 $ 38,571 $ 16,750   $ 25,377
Interest rate swaps, variable to fixed interest rates (percent)   5.40% 5.30% 6.99% 1.965% 1.71%   3.70%
Future increase in notional amount             $ 42,247