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Significant Accounting Policies, Share Repurchase Program (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Sep. 30, 2019
Significant Accounting Policies [Abstract]
Authorized amount of share repurchase program				$ 125,000
Shares repurchased (in shares)	1,500,000		535,000
Shares repurchased	$ 90,550	$ 0	$ 34,400

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- References

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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