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Employee Benefit Plans (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Period of service before an employee is eligible for contribution | 1 year |  |
Common stock authorized for issuance but not yet issued for ESPP | 246 |  |
Common stock authorized and reserved for ESPP | 250 |  |
ESPP employee contribution, percentage | 15.00% |  |
Shares issued under ESPP | 1 | 1 | 1
Fair value of investments in rabbi trust | $ 19,887 | $ 17,843 |
Deferred Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage on first 3% | 100.00% |  |
Employer matching contribution, percentage on next 2% | 50.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 100% under the Deferred Plan | 3.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 50% under the Deferred Plan | 2.00% |  |
Total liabilities under Deferred Plan | $ 19,887 | 17,843 |
Deferred Compensation Arrangement with Individual, Contributions by Employer | $ 199 | 225 | $ 617
401(k) Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage on first 3% | 100.00% |  |
Employer matching contribution, percentage on next 2% | 50.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 100% | 3.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution of 50% | 2.00% |  |
Period of service before an employee is eligible for contribution | 1 year |  |
Company matching contributions | $ 6,072 | $ 5,939 | $ 4,995

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