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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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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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