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Fair Value Fair Value (Details 2)
$ in Thousands
Mar. 31, 2019
USD ($)
Not Designated as Hedging Instrument | Interest Rate Cap  
Derivative instruments and Hedging Activities  
Notional amount $ 587,272
Derivative weighted average interest rate 3.10%
Derivative, average cap interest rate 6.60%
Cash Flow Hedges | Interest Rate Cap  
Derivative instruments and Hedging Activities  
Notional amount $ 33,929
Derivative weighted average interest rate 4.80%
Derivative, average cap interest rate 5.90%
Cash Flow Hedges | Interest Rate Swap  
Derivative instruments and Hedging Activities  
Notional amount $ 250,000
Derivative, average cap interest rate 3.00%