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Fair Value - Assets and Liabilities Measured at Fair Value and Related Hierarchy Levels (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Total available-for-sale securities | $ 24,088 | $ 23,358
Level 2 | Interest rate swaps |  |
Assets |  |
Derivative asset | 34,014 | 19,595
Liabilities |  |
Interest rate swaps | 0 | 5,373
Level 1 |  |
Assets |  |
Executive deferred compensation plan trust | 6,971 | 6,798
Municipal bonds | Level 2 |  |
Assets |  |
Total available-for-sale securities | 400 | 534
Asset-backed securities | Level 2 |  |
Assets |  |
Total available-for-sale securities | 319 | 345
Mortgage-backed securities | Level 2 |  |
Assets |  |
Total available-for-sale securities | 275 | 305
Fixed-income mutual fund | Level 1 |  |
Assets |  |
Total available-for-sale securities | $ 23,094 | $ 22,174

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