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Equity Compensation Plans - Summary of Activity Related to Executive Deferred Compensation Plan (Details) - Executive Deferred Compensation Plan - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward] |  |  |
Balance at beginning of period | $ 2,088 | $ 2,095 | $ 2,049
New deferrals | 750 | 558 | 600
Accrued interest | 58 | 53 | 61
Withdrawals | (725) | (618) | (615)
Balance at End of Period | $ 2,171 | $ 2,088 | $ 2,095

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- Definition Deferred Compensation Arrangement with Individual, Accrued Interest + References No definition available. + Details
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- Definition Deferred Compensation Arrangement with Individual, New Deferrals + References No definition available. + Details
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- Definition Deferred Compensation Arrangement with Individual, Withdrawals + References No definition available. + Details
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- Definition Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward] + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Details
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