Share Repurchases (Details) - USD ($)	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Share Repurchases [Line Items]
Purchase of common stock	$ 52,916,000	$ 23,280,000
February 2018 Authorization [Member]
Share Repurchases [Line Items]
Number of shares authorized to be repurchased		20,000,000
Share repurchases	548,659	261,807
Purchase of common stock	$ 52,916,000	$ 23,280
Treasury Stock Acquired, Average Cost Per Share	$ 96.45	$ 88.92
Remaining number of shares authorized to be repurchased	7,811,385

Share repurchase [Line Items]

No definition available.

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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
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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