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Stock Based Compensation Details (Details) - shares | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum​Number​OfShares​Available​ToBe​Granted​Under​Award​Stock​Plan |  |  | 28,800,000 |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) | 2,600,000 | 2,400,000 |  |  |  |
Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares​Available​For​Issuance​Under​Stock​Incentive​Plan |  |  |  |  |  | 12,093,536
Time-Based [Member] | Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 454,313 | 241,334 | 365,306 |
Perfomance Based [Member] | Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod |  |  | 1,123,408 | 1,151,578 | 1,578,892 |
Performance Shares [Member] | Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  | 2,489,905 | 326,808 | 2,870,638 |

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- Definition Maximum​Number​OfShares​Available​ToBe​Granted​Under​Award​Stock​Plan + References No definition available. + Details
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- Definition Share​Based​Compensation​Arrangement​ByShare​Based​Payment​Award​Equity​Instruments​Other​Than​Options​Grants​Not​Yet​Awarded​InPeriod + References No definition available. + Details
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- Definition Shares​Available​For​Issuance​Under​Stock​Incentive​Plan + References No definition available. + Details
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- Definition The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period. + 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 (c)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation 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=96867065&loc=d3e5070-113901 + Details
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