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Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounting Standards Update 2016-01 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy |  | $ 0
Accounting Standards Update 2014-09 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy |  | (102)
Retained Earnings | Accounting Standards Update 2016-01 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy |  | 331
Retained Earnings | Accounting Standards Update 2014-09 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy |  | $ (102)
Minimum | Accounting Standards Update 2016-02 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy | $ 7,000 |
Maximum | Accounting Standards Update 2016-02 |  |
Retained Earnings Adjustments [Line Items] |  |
Impact of change in accounting policy | $ 9,000 |

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