Employee Benefit Plans (Narrative) (Details) - 401(K) [Member] - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Company's matching percentage of employees' contribution	100.00%
Company's matching contribution of employees' salary	3.50%	3.00%	3.00%
Company's total contributions	$ 1,600,000	$ 1,400,000	$ 1,400,000
Discretionary contributions	$ 0	$ 0	$ 0

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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