The cash outflow to reacquire common stock during the period.

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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

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Sale of Stock, Shares Sold by Other Stockholders

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Time Period In Which to Exercise the Over-Allotment Option

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Common Stock (Narrative) (Details) - USD ($)		12 Months Ended
Common Stock (Narrative) (Details) - USD ($)	Jun. 20, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 11, 2019	Aug. 06, 2015
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	1,954,852
Price per share (in dollars per share)	$ 69.25
Consideration received from stock issuance, net	$ 130,800,000
Shares sold by other stockholders (in shares)	545,148
Time period In which to exercise the over-allotment option	30 days
Share repurchase program, authorized amount					$ 100,000,000.0
Treasury stock acquired (in shares)		0	134,900
Cost of common shares repurchased			$ 7,900,000
Share repurchase, average price per share			$ 58.82
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	375,000
Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Share repurchase program, authorized amount				$ 150,000,000