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Common Stock and Stock-Based Compensation Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation, Activity [Table Text Block] | The following table summarizes stock-based compensation awards granted during the three months ended June 30, 2019:
| Number of Shares Granted |  | Weighted Average Grant-Date Fair Value per Award
Restricted stock units | 953,666 |  |  | $ | 22.21 |
Restricted stock awards | 17,538 |  |  | $ | 22.24 |
Performance units | 476,394 |  |  | $ | 22.22 |

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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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