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RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Designated
Cash flow
Dec. 31, 2012
Designated
Cash flow
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap one
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap one
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap two
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap two
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap three
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap three
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap four
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap four
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap five
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap five
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap six
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap six
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap seven
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap seven
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap eight
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap eight
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap nine
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap nine
Mar. 31, 2013
Designated
Cash flow
Hedge Product, Swap ten
Dec. 31, 2012
Designated
Cash flow
Hedge Product, Swap ten
Derivative financial instruments                                              
Notional Amount $ 400,000,000     $ 40,000,000   $ 40,000,000   $ 20,000,000   $ 75,000,000   $ 50,000,000   $ 50,000,000   $ 25,000,000   $ 40,000,000   $ 40,000,000   $ 20,000,000  
Swap, Strike rate (as a percent)       1.8025%   1.8025%   1.8025%   1.336%   1.336%   1.336%   1.3375%   2.459%   2.4725%   2.475%  
Fair Value   (18,443,000) (19,665,000) (1,757,000) (1,873,000) (1,758,000) (1,875,000) (878,000) (937,000) (2,217,000) (2,378,000) (1,474,000) (1,583,000) (1,475,000) (1,583,000) (743,000) (799,000) (3,238,000) (3,433,000) (3,269,000) (3,470,000) (1,634,000) (1,734,000)
Maximum number of days outstanding to have the option to borrow at the LIBOR 30 days                                            
Unrealized losses reclassified from accumulated other comprehensive loss $ 1,500,000