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Share Repurchase Program and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Repurchase Program, Additional Authorized Amount							$ 2,000,000
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]
Remaining Amount to Repurchase under the program	$ 1,500,000						$ 1,500,000
Shares Purchased Under Share Repurchase Program	28,300,000						28,300,000
Treasury Stock, Value, Acquired, Cost Method	$ 186,250	$ 186,250	$ 186,250	$ 118,750	$ 118,749	$ 118,750	$ 558,700	$ 356,200
Number of shares repurchased							(794,603)	(598,539)
Average price of share repurchased, per share							$ 703.16	$ 595.18
Exercise of stock options and restricted stock units, shares reissued							226,841	102,174

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- Definition

Number of treasury shares reissued during the period as a result of the exercise of stock options and vesting of restricted stock units.

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Share Repurchase Program and Treasury Stock.

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- Definition

Shares repurchased program-to-date by a Company's share repurchase program.

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- Definition

The additional amount authorized by an entity's Board of Directors under a stock repurchase program.

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Amount remaining of a stock repurchase plan authorized.

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

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-Publisher FASB
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-SubTopic 10
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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