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Fair Value Measurements (Details) - Level 2 - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Interest rate derivative financial instruments | $ 8,440 | $ 13,576
Total | 11,685 | 16,377
Liabilities: |  |
Interest rate derivative financial instruments | 2,684 | 1,811
Total | 2,684 | 1,811
Investments |  |
Assets: |  |
Investments | 3,232 | 2,788
Demand obligations |  |
Assets: |  |
Investments | $ 13 | $ 13

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