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Significant Transactions During the Three Months Ended 2018 and Subsequent Events (Details) - USD ($) | 1 Months Ended
--- | ---
Mar. 31, 2018 | Jan. 31, 2018
Other Commitments [Line Items] |  |
Proceeds from full redemption of a preferred equity investment in a joint venture |  | $ 2,400,000
Promote income | $ 20,500,000 |
Stock repurchased and retired during the period (in shares) |  | 16,834
Stock repurchased and retired during the period |  | $ 3,800,000
Purchase authority remaining under stock repurchase plan | 245,200,000 |
Senior Notes [Member] | Senior Unsecured Notes At 4.500% [Member] |  |
Other Commitments [Line Items] |  |
Debt, face amount | $ 300,000,000 |
Debt, term (in years) | 30 years |
Debt, stated interest rate | 4.50% |
BEX III [Member] |  |
Other Commitments [Line Items] |  |
Repayments of related party debt |  | $ 29,500,000

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