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Share-based Compensation - Equity Award Modifications (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 19, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense not yet recognized, options |  |  |  |  | $ 8,914 |  |  |
Exercise prices (in dollars per share) |  |  |  |  | $ 19.30 | $ 21.81 | $ 26.12 | $ 25.84
Number of stock options outstanding (in shares) |  |  |  |  | 9,903 | 10,928 | 11,427 | 10,919
Employee Time Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  | $ 15,000 |  |  |
Class A Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average stock closing price period | 20 days |  |  |  |  |  |  |
Exercise prices (in dollars per share) | $ 17.44 |  |  |  |  |  |  |
Class A Common Stock | Weighted Average |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ 17.44 |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of stock options outstanding (in shares) | 5,300 |  |  |  |  |  |  |
Class B Common Stock | Employee Time Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense |  |  | $ 5,100 |  |  |  |  |
Stock compensation expense not yet recognized, options |  |  |  |  | $ 2,500 |  |  |
2013 Long-Term Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Exercise prices (in dollars per share) |  | $ 23.20 |  | $ 23.20 |  |  |  |
2013 Long-Term Incentive Plan | Employee Time Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares affected in modification of stock options (in shares) |  | 5,338 |  |  |  |  |  |
Stock compensation expense |  |  |  | $ 6,000 |  |  |  |
Stock compensation expense not yet recognized, options |  | $ 5,000 |  | $ 5,000 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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