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Fair Value (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) derivative | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) derivative | Jun. 30, 2015 USD ($)
Derivative instruments and Hedging Activities |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent | $ (26,788,000) | $ (6,000) | $ (74,545,000) | $ (36,000)
Payments for Hedge, Financing Activities |  |  | 14,847,000 | $ 0
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months |  |  | $ 6,978,000 |
Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Number of derivative instruments held | derivative | 11 |  | 11 |
Interest Rate Cap [Member] | Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Notional amount | $ 36,317,000 |  | $ 36,317,000 |
Weighted average interest rate (as a percent) | 2.60% |  | 2.60% |
Weighted average capped interest rate (as a percent) | 5.90% |  | 5.90% |
Interest Rate Swap [Member] | Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Notional amount | $ 800,000,000 |  | $ 800,000,000 |
Notional amounts entered into during period | 150,000,000 |  | $ 600,000,000 |
Derivative, Notional Amounts Settled During Period | $ 400,000,000 |  |  |
Weighted average capped interest rate (as a percent) | 2.30% |  | 2.30% |
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Number of derivative instruments held | derivative | 15 |  | 15 |
Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Notional amount | $ 723,831,000 |  | $ 723,831,000 |
Weighted average interest rate (as a percent) | 2.20% |  | 2.20% |
Weighted average capped interest rate (as a percent) | 6.20% |  | 6.20% |

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