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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
	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

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No definition available.

+ Details

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- Definition

Deferred Compensation Arrangement with Individual, New Deferrals

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No definition available.

+ Details

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- Definition

Deferred Compensation Arrangement with Individual, Withdrawals

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No definition available.

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Balance Type:	debit
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- Definition

Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward]

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No definition available.

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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.

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No definition available.

+ Details

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- Details

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