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Fair Value (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) venture derivative | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative instruments and Hedging Activities |  |  |
Derivative, excluded component, gain, recognized in earnings |  | $ 753,000 |
Amortization period of deferred gain (loss) on discontinuation of interest rate fair value hedge | 10 years |  |
Derivative, notional amounts settled during period | $ 300,000,000 |  |
Receipts (payments) for termination of forward interest rate swaps | 12,598,000 | 391,000 | $ (14,847,000)
Gain (loss) on cash flow hedges | $ 5,132,000 | $ (13,979,000) | $ (5,556,000)
Cash Flow Hedges Interest Rate Caps |  |  |
Derivative instruments and Hedging Activities |  |  |
Number of derivative instruments held | derivative | 4 |  |
Puts |  |  |
Derivative instruments and Hedging Activities |  |  |
Number of ventures in which entity is required to purchase interest in investment at guaranteed minimum amount | venture | 2 |  |
Interest Rate Caps | Cash Flow Hedges Interest Rate Caps |  |  |
Derivative instruments and Hedging Activities |  |  |
Notional balance | $ 34,155,000 |  |
Weighted average interest rate (as a percent) | 4.50% |  |
Weighted average capped interest rate (as a percent) | 5.90% |  |
Interest Rate Swap | Cash Flow Hedges Interest Rate Caps |  |  |
Derivative instruments and Hedging Activities |  |  |
Notional balance | $ 250,000,000 |  |
Weighted average capped interest rate (as a percent) | 3.00% |  |
Derivative, notional amounts entered into during period | $ 250,000,000 |  |
Non-designated Hedges Interest Rate Caps |  |  |
Derivative instruments and Hedging Activities |  |  |
Number of derivative instruments held | derivative | 10 |  |
Non-designated Hedges Interest Rate Caps | Interest Rate Caps |  |  |
Derivative instruments and Hedging Activities |  |  |
Notional balance | $ 588,383,000 |  |
Weighted average interest rate (as a percent) | 3.30% |  |
Weighted average capped interest rate (as a percent) | 6.60% |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative instruments and Hedging Activities |  |  |
Gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred | $ 5,752,000 |  |

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