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Share Repurchase Program and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]
Remaining Amount to Repurchase under the program	$ 227,200
Treasury Stock Acquired, Repurchase Authorization	2000000000
Shares Purchased Under Share Repurchase Program	27,300,000
Treasury Stock, Value, Acquired, Cost Method	$ 356,249	$ 335,000	$ 399,997
Number of shares repurchased	(598,539)	(647,756)
Average price of share repurchased, per share	$ 595.18	$ 517.15
Exercise of stock options and restricted stock units, shares reissued	102,174	206,646

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

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Amount remaining of a stock repurchase plan authorized.

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

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-Publisher FASB
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-Topic 505
-SubTopic 30
-Section 45
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Description of share repurchase program, including accounting treatment.

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

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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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