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Fair Value Measurements (Details) - Level 2 - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Interest rate derivative financial instruments | $ 13,576 | $ 9,501
Total | 16,377 | 10,358
Liabilities: |  |
Interest rate derivative financial instruments | 1,811 | 10,579
Total | 1,811 | 10,579
Investments |  |
Assets: |  |
Investments | 2,788 | 844
Demand obligations |  |
Assets: |  |
Investments | $ 13 | $ 13

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