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Senior Notes and Unsecured Revolving Credit Facility Notes Payable - Maturities (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Long-term Debt, Maturities, Repayments of Principal in 2018 $ 0
Long-term Debt, Maturities, Repayments of Principal in 2019 0
Long-term Debt, Maturities, Repayments of Principal in 2020 0
Long-term Debt, Maturities, Repayments of Principal in 2021 0
Long-term Debt, Maturities, Repayments of Principal in 2022 325,000
Long Term Debt, Maturities, Repayments of Principal $ 325,000