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New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
New Accounting Pronouncements and Changes in Accounting |  |  |
Other non-current assets | $ 217,771 |  | $ 228,682
Retained earnings | $ 957,230 |  | $ 948,148
Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements and Changes in Accounting |  |  |
Retained earnings |  | $ 7,000 |
Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements and Changes in Accounting |  |  |
Other non-current assets |  | (5,500) |
Retained earnings |  | $ (5,500) |

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