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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Restricted Stock Units Activity |
| Shares subject to restriction (thousands) |  | Weighted average grant date fair value
Nonvested at December 31, 2017 | 1,593 |  |  | $ | 38.86 |
Granted | 625 |  |  | $ | 52.64 |
Vested | (486 | ) |  | $ | 41.05 |
Forfeited | (7 | ) |  | $ | 49.48 |
Nonvested at March 31, 2018 | 1,725 |  |  | $ | 43.26 |
Granted | 68 |  |  | $ | 50.86 |
Vested | (68 | ) |  | $ | 51.11 |
Forfeited | (142 | ) |  | $ | 45.68 |
Nonvested at June 30, 2018 | 1,583 |  |  | $ | 43.03 |
Schedule of Share-based Compensation, Performance Shares Award Unvested Activity |
| Number of shares (thousands) |  | Weighted average grant date fair value
Non-vested at December 31, 2017 | 355 |  |  | $ | 39.42 |
Granted | 175 |  |  | $ | 52.64 |
Non-vested at March 31, 2018 | 530 |  |  | $ | 43.79 |
Granted | 95 |  |  | $ | 50.20 |
Forfeited | (144 | ) |  | $ | 45.82 |
Non-vested at June 30, 2018 | 481 |  |  | $ | 44.45 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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) -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 Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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