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Derivative Financial Instruments (Narrative) (Details) (Interest Rate Swap [Member], USD $)
3 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Credit Facility [Member]
Feb. 06, 2009
Credit Facility [Member]
Mar. 31, 2013
Loans [Member]
Mar. 03, 2008
Loans [Member]
Oct. 04, 2011
Union Bank [Member]
Oct. 04, 2011
Bank Of America [Member]
Derivative Financial Instruments [Line Items]                
Secured notes       $ 120,000,000   $ 18,000,000    
Fixed rate       1.93%   4.25%    
Debt instrument, maturity date     January 3, 2012          
Maximum borrowing capacity             20,000,000 18,000,000
Floating rate, LIBOR plus basis points (as a percentage)             0.40% 0.50%
Credit facility, maturity date         Mar. 01, 2013   Jan. 02, 2015 Mar. 01, 2013
Fair market value of the interest rate swap $ 0 $ 103,000