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Derivatives and Hedging (Details) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Interest rate swap
Dec. 31, 2013
Interest rate swap
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type one
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type one
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type two
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type two
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type three
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type three
Sep. 30, 2014
Designated as Hedging Instrument
ISwap-cash flow, hedge type four
Dec. 31, 2013
Designated as Hedging Instrument
ISwap-cash flow, hedge type four
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type five
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type five
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type six
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type six
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type seven
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type seven
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type eight
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type eight
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type nine
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type nine
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type ten
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type ten
Sep. 30, 2014
Designated as Hedging Instrument
Swap-cash flow, hedge type eleven
Dec. 31, 2013
Designated as Hedging Instrument
Swap-cash flow, hedge type eleven
Sep. 30, 2014
Interest Expense
Sep. 30, 2013
Interest Expense
Financial Instruments: Derivatives and Hedging                                                          
Notional value $ 1,000,000,000 $ 1,000,000,000 $ 1,000,000,000     $ 275,000,000 $ 275,000,000 $ 175,000,000 $ 175,000,000 $ 175,000,000 $ 175,000,000 $ 16,500,000 $ 16,500,000 $ 16,500,000 $ 16,500,000 $ 40,500,000 $ 40,500,000 $ 41,500,000 $ 41,500,000 $ 18,000,000 $ 18,000,000 $ 17,000,000 $ 17,000,000 $ 125,000,000 $ 125,000,000 $ 100,000,000 $ 100,000,000    
Hedge interest rate (as a percent)           1.1175%   1.5625%   1.635%   1.825%   1.751%   1.825%   1.751%   1.825%   1.751%   2.018%   1.944%      
Fair value assets       1,474,000 3,161,000 1,474,000 3,161,000                                            
Fair value liabilities       8,800,000 9,100,000     1,478,000 1,866,000 1,923,000 2,406,000 225,000 238,000 177,000 181,000 553,000 585,000 446,000 456,000 246,000 260,000 183,000 187,000 2,145,000 1,838,000 1,385,000 1,085,000    
Total (7,287,000) (7,287,000) (5,941,000)                                                    
Unrealized gains (losses) included in accumulated other comprehensive loss 7,287,000 7,287,000 (5,941,000)                                                    
Amount of ineffective hedges 0 0                                                      
Amount reclassified from accumulated other comprehensive income into interest expense                                                       $ 8,700,000 $ 611,000