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Employee benefit plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
schedule of share-based compensation, Performance Stock Units Award Activity [Table Text Block] | A summary of the Company’s PSU activity is as follows:
| Shares (in thousands) |  | Weighted-average grant date fair value
Non-vested shares at December 31, 2019 | 788 |  |  | $ | 7.51 |
Granted | 1,231 |  |  | 4.05 |
Vested | (247) |  |  | 7.50 |
Forfeited | (453) |  |  | 6.92 |
Non-vested shares at December 31, 2020 | 1,319 |  |  | $ | 4.48 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of the Company’s stock option activity is as follows:
| Shares (in thousands) |  | Weighted-average exercise price |  | Weighted-average remaining contractual term (in years) |  | Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2019 | 3,963 |  |  | $ | 10.16 |  |  | 6.35 |  | $ | 374 |
Granted | 1,025 |  |  | 4.01 |  |  |  |  |
Exercised | (357) |  |  | 5.50 |  |  |  |  |
Forfeited/Cancelled | (1,200) |  |  | 10.20 |  |  |  |  |
Outstanding at December 31, 2020 | 3,431 |  |  | $ | 8.79 |  |  | 6.50 |  | $ | 6,259 |
Vested and expected to vest at December 31, 2020 | 3,431 |  |  | $ | 8.79 |  |  | 6.50 |  | $ | 6,259 |
Exercisable at December 31, 2020 | 2,195 |  |  | $ | 11.06 |  |  | 5.18 |  | $ | 1,893 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of the Company’s RSU activity is as follows:
| Shares (in thousands) |  | Weighted-average grant date fair value
Non-vested shares at December 31, 2019 | 8,225 |  |  | $ | 6.11 |
Granted | 8,759 |  |  | 4.59 |
Vested | (3,962) |  |  | 6.04 |
Forfeited | (2,383) |  |  | 5.40 |
Non-vested shares at December 31, 2020 | 10,639 |  |  | $ | 5.04 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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