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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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