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Stock Based Compensation Employee Stock Purchase Plan Details (Details) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Aug. 31, 2017 $ / shares | Jul. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Aug. 31, 2016 $ / shares | Jul. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Aug. 31, 2015 $ / shares | Jul. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 0 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate | 10.00% |  |  |  |  |  |  |  |
Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 4,197,920 |  |  |  |  |  |  |  |
Employee Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 4,151,251 |  |  |  |  |  |  |  |
Threshold​Period​Worked​Per​Week​ByEmployees | 20 |  |  |  |  |  |  |  |
Allotted​Value​Maximum | $ | $ 25,000 |  |  |  |  |  |  |  |
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Subscription​Period​Beginning | --08-01 |  |  |  |  |  |  |  |
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Subscription​Period​Ending | --07-31 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent | 85.00% |  |  |  |  |  |  |  |
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Percent​OfMarket​Price | 15.00% |  |  |  |  |  |  |  |
Value​OfOne​Year​Stock​Option​Percentage | 85.00% |  |  |  |  |  |  |  |
Estimated​Fair​Value​Per​Share​Option | $ / shares |  | $ 8.64 |  |  | $ 7.61 |  |  | $ 6.43 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 529,012 |  |  | 514,665 |  |  | 539,389
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Shares​Issued​Aggregate​Purchase​Value | $ |  |  | $ 16,400,000 |  |  | $ 15,000,000.0 |  |  | $ 14,400,000
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Shares​Issued​Aggregate​Purchase​Price​Per​Share | $ / shares |  |  | $ 31.03 |  |  | $ 29.23 |  |  | $ 26.62
Shares held in Employee Stock Option Plan, Suspense Shares | 217,514 |  |  | 247,023 |  |  | 231,803 |  |
Cash​Received​From​Proceeds​ByParticipants | $ | $ 8,200,000 |  |  | $ 7,700,000 |  |  | $ 6,800,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 17,000,000 |  |  |  |  |  |  |  |

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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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