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Stock Based Compensation Stock Options Outstanding (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of PSP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:
| Weighted- average grant date fair value |  | Granted shares |  | Awarded shares |  | Shares not yet awarded
Outstanding at January 1, 2016 | $ | 4.52 |  |  | 3,204,428 |  |  | 3,188,428 |  |  | 16,000 |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | 8,000 |  |  | (8,000 | )
Vested | $ | 3.19 |  |  | (1,012,844 | ) |  | (1,012,844 | ) |  | — |
Forfeited | $ | 5.26 |  |  | (185,034 | ) |  | (177,034 | ) |  | (8,000 | )
Outstanding at December 31, 2016 | $ | 5.11 |  |  | 2,006,550 |  |  | 2,006,550 |  |  | — |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | 4.81 |  |  | (277,602 | ) |  | (277,602 | ) |  | — |
Forfeited | $ | 5.24 |  |  | (34,472 | ) |  | (34,472 | ) |  | — |
Outstanding at December 31, 2017 | $ | 5.16 |  |  | 1,694,476 |  |  | 1,694,476 |  |  | — |
Granted | $ | — |  |  | — |  |  | — |  |  | — |
Awarded | $ | — |  |  | — |  |  | — |  |  | — |
Vested | $ | 5.53 |  |  | (453,860 | ) |  | (453,860 | ) |  | — |
Forfeited | $ | 4.92 |  |  | (44,524 | ) |  | (44,524 | ) |  | — |
Outstanding at December 31, 2018 | $ | 5.03 |  |  | 1,196,092 |  |  | 1,196,092 |  |  | — |
A summary of SIP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:
| Weighted- average grant date fair value |  | Granted shares |  | Awarded shares |  | Shares not yet awarded |
Outstanding at January 1, 2016 | $ | 14.37 |  |  | 12,553,944 |  |  | 2,259,988 |  |  | 10,293,956 |  |
Granted | $ | 17.76 |  |  | 1,944,198 |  |  | 365,306 |  |  | 1,578,892 |  | (1)
Awarded | $ | 12.46 |  |  | — |  |  | 2,862,638 |  |  | (2,862,638 | ) |
Vested | $ | 13.66 |  |  | (333,768 | ) |  | (333,768 | ) |  | — |  |
Forfeited | $ | 12.67 |  |  | (1,908,262 | ) |  | (351,576 | ) |  | (1,556,686 | ) |
Outstanding at December 31, 2016 | $ | 14.98 |  |  | 12,256,112 |  |  | 4,802,588 |  |  | 7,453,524 |  |
Granted | $ | 20.82 |  |  | 1,392,912 |  |  | 241,334 |  |  | 1,151,578 |  | (2)
Awarded | $ | 15.72 |  |  | — |  |  | 326,808 |  |  | (326,808 | ) |
Vested | $ | 12.61 |  |  | (484,914 | ) |  | (484,914 | ) |  | — |  |
Forfeited | $ | 14.89 |  |  | (342,120 | ) |  | (76,212 | ) |  | (265,908 | ) |
Outstanding at December 31, 2017 | $ | 15.58 |  |  | 12,821,990 |  |  | 4,809,604 |  |  | 8,012,386 |  |
Granted | $ | 22.87 |  |  | 1,577,721 |  |  | 454,313 |  |  | 1,123,408 |  | (3)
Awarded | $ | 15.89 |  |  | — |  |  | 2,489,905 |  |  | (2,489,905 | ) |
Vested | $ | 14.09 |  |  | (933,916 | ) |  | (933,916 | ) |  | — |  |
Forfeited | $ | 16.37 |  |  | (2,363,420 | ) |  | (224,587 | ) |  | (2,138,833 | ) |
Outstanding at December 31, 2018 | $ | 16.69 |  |  | 11,102,375 |  |  | 6,595,319 |  |  | 4,507,056 |  |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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