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Operations and Summary of Significant Accounting Policies - Stock Repurchase Program (Details) - USD ($)	1 Months Ended			12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Aug. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 01, 2017	Aug. 31, 2017	Feb. 29, 2016
2016 Stock Repurchase Program
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount			$ 125,000,000				$ 125,000,000.0	$ 50,000,000.0
Repurchase of common stock (in shares)			1,137,656	1,244,003
Stock repurchase, average cost per share (in USD per share)			$ 43.95		$ 43.01
June 2017 ASR Program [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount	$ 60,000,000	$ 20,000,000.0		$ 60,000,000
Repurchase of common stock (in shares)		460,887		1,138,387
Stock repurchase, average cost per share (in USD per share)		$ 43.39
December 2017 ASR Program [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount						$ 50,000,000.0
Repurchase of common stock (in shares)	677,500
Settlement of accelerated share repurchase program						$ 40,000,000
Stock repurchase, average cost per share (in USD per share)	$ 59.04
2017 Stock Repurchase Program
Accelerated Share Repurchases [Line Items]
Common stock repurchase, authorized amount	$ 151,500,000			$ 151,500,000			$ 275,000,000.0
Repurchase of common stock (in shares)				460,887
Shares held in treasury (in shares)				677,500

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Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

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-Name Accounting Standards Codification
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-SubTopic 30
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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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