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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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