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Employee Benefit Plan - Narrative (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Retirement Benefits [Abstract] |  |
Amortization of amounts previously recognized in accumulated other comprehensive income | $ 318,000 | $ 228,000
Contribution to pension plan | $ 0 | $ 0

X
- Definition Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References No definition available. + Details
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- References No definition available. + Details
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X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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