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Retirement Savings Plans (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Liability to participants under deferred compensation plan | $ 9,475,000 | $ 9,319,000 |
Current liability to participants under deferred compensation plan | 1,200,000 | 1,437,000 |
401(k) Profit-Sharing Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Company contributions to the plan | 8,900,000 | 7,666,000 | $ 7,754,000
Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Company contributions to the plan | 350,000 | 210,000 | $ 200,000
Other Noncurrent Assets [Member] | Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Fair value of mutual fund investments | 9,475,000 | 9,319,000 |
Short-term Investments [Member] | Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Fair value of mutual fund investments | $ 1,200,000 | $ 1,437,000 |

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