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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