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Fair Value (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) derivative | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) venture derivative | Jun. 30, 2017 USD ($)
Derivative instruments and Hedging Activities |  |  |  |
Derivative, notional amounts settled during period |  |  | $ 300,000 |
Receipts (payments) for termination of forward interest rate swaps |  |  | $ (12,598) | $ (391)
Amortization period of deferred gain (loss) on discontinuation of interest rate fair value hedge |  |  | 10 years |
(Loss) gain on cash flow hedges |  |  | $ 11,499 |
(Loss) gain on cash flow hedges | $ 0 | $ (16,158) | $ 11,499 | $ (16,013)
Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Number of derivative instruments held | derivative | 1 |  | 1 |
Interest Rate Cap | Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Notional amount | $ 34,600 |  | $ 34,600 |
Interest Rate Swap | Cash Flow Hedges |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Notional amount | $ 0 |  | $ 0 |
Put Option |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Number of ventures in which entity is required to purchase interest in investment at guaranteed minimum amount | venture |  |  | 3 |
Not Designated as Hedging Instrument |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Number of derivative instruments held | derivative | 14 |  | 14 |
Not Designated as Hedging Instrument | Interest Rate Cap |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Notional amount | $ 687,005 |  | $ 687,005 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Derivative instruments and Hedging Activities |  |  |  |
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months |  |  | $ 5,752 |

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