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Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Interest rate swaps maturing June 2017 [Member]
Jun. 30, 2013
Interest rate swaps maturing June 2017 [Member]
Jun. 30, 2014
Interest rate swaps maturing March 2015 [Member]
Jun. 30, 2013
Interest rate swaps maturing March 2015 [Member]
Jun. 30, 2014
Interest Rate Swaps Maturing November Two Thousand Eighteeen [Member] [Domain]
Jun. 30, 2014
Interest Rate Swaps Maturing June Two Thousand Nineteen [Member]
Jun. 30, 2014
Interest Rate Swaps Maturing September Two Thousand Nineteen [Domain]
Summary Of Derivative Instruments And Hedged Items [Abstract]                  
Issuance date     May 24, 2011   Feb. 24, 2011   Nov. 12, 2013 Feb. 25, 2014 May 06, 2014
Maturity date     Jun. 01, 2017   Mar. 02, 2015   Nov. 15, 2018 Jun. 01, 2019 Sep. 03, 2019
Face value of medium - term notes     $ 350,000   $ 350,000   $ 300,000 $ 350,000 $ 400,000
Aggregate notional amount of interest rate swaps $ 600,000 $ 400,000 $ 150,000   $ 150,000   $ 100,000 $ 100,000 $ 100,000
Fixed interest rate     3.50%   3.15%   2.45% 2.55% 2.45%
Weighted-average variable interest rate on hedged debt     1.42% 1.51% 1.28% 1.41% 1.18% 1.10% 0.85%