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Prepaid Expenses and Other Assets, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Prepaid Expense and Other Assets [Abstract] |  |  |  |
Prepaid expenses | $ 31,259 | $ 24,670 |  |
Lease incentives, net | 18,583 | 19,011 |  |
Furniture, fixtures and equipment, net | 7,087 | 5,256 |  |
Non-real estate equity investments | 5,085 | 5,056 |  |
Marketable securities in deferred compensation plan | 4,346 | 4,616 |  |
Restricted cash | 3,440 | 2,570 | $ 1,766 | $ 2,756
Construction contract costs incurred in excess of billings | 2,821 | 4,884 |  |
Deferred tax asset, net | 2,080 | 1,892 |  |
Other assets | 4,648 | 3,379 |  |
Prepaid expenses and other assets, net | 79,349 | 71,334 |  |
Taxable REIT Subsidiary |  |  |  |
Mortgage and Other Investing Receivables [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | $ 3,000 | $ 1,400 |  |

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