Fair Value - Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	$ 1,594	$ 1,410
Assets Fair Value Disclosure	1,594	1,410
Fair Value Inputs Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	0	0
Assets Fair Value Disclosure	0	0
Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	1,594	1,410
Assets Fair Value Disclosure	1,594	1,410
Fair Value Inputs Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	0	0
Assets Fair Value Disclosure	$ 0	$ 0