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Fair Value (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) venture derivative | Mar. 31, 2017 USD ($)
Derivative instruments and Hedging Activities |  |
Derivative, notional amounts settled during period | $ 300,000 |
Receipts (payments) for termination of forward interest rate swaps | $ (12,598) | $ 0
Amortization period of deferred gain (loss) on discontinuation of interest rate fair value hedge | 10 years |
Gain on cash flow hedges | $ 11,501 | $ 145
Cash Flow Hedges |  |
Derivative instruments and Hedging Activities |  |
Number of derivative instruments held | derivative | 1 |
Interest Rate Cap | Cash Flow Hedges |  |
Derivative instruments and Hedging Activities |  |
Notional amount | $ 34,820 |
Interest Rate Swap | Cash Flow Hedges |  |
Derivative instruments and Hedging Activities |  |
Notional amount | $ 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 |
Not Designated as Hedging Instrument | Interest Rate Cap |  |
Derivative instruments and Hedging Activities |  |
Notional amount | $ 688,044 |
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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