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Stock based compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity | The following tables provide additional information related to the options:
2016 Activity | Number of shares (in thousands) |  | Weighted average exercise price |  | Remaining weighted average contractual life in years |  | Intrinsic value (in millions)
Beginning balance | 5,250.4 |  |  | $ | 12.94 |  |  | 5.7 |  | $ | 15.1 |
Granted | 818.6 |  |  | $ | 9.39 |  |  |  |  | — |
Exercised | (151.3 | ) |  | $ | 11.31 |  |  |  |  | — |
Forfeited/expired | (46.6 | ) |  | $ | 20.93 |  |  |  |  | — |
Total outstanding | 5,871.1 |  |  | $ | 12.42 |  |  | 5.3 |  | $ | 59.1 |
Options exercisable | 4,403.4 |  |  | $ | 11.74 |  |  | 4.2 |  | $ | 45.2 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The assumptions used in the Black-Scholes pricing model to estimate the fair value of the options granted in 2016, 2015 and 2014 are as follows:
| 2016 |  | 2015 |  | 2014
Weighted average fair value | $3.85 |  | $6.36 |  | $8.47
Assumptions |  |  |  |  |
Expected life (in years) | 6.25 |  | 6.30 |  | 6.25
Volatility | 40% |  | 33% |  | 27%
Dividend yield | —% |  | —% |  | —%
Risk free interest rate | 1.40% |  | 1.81% |  | 1.96%
Nonvested Restricted Stock Shares Activity | Further information about the restricted stock units follows (shares in thousands):
Restricted stock units |
2016 Activity |
Nonvested at beginning of year | 1,212.2 |
Granted | 1,075.8 |
Vested | (363.8 | )
Forfeited | (159.1 | )
Nonvested at the end of year | 1,765.1 |
Restricted stock generally vests over a three or four year period from the date of grant. Further information about the restricted stock follows (shares in thousands):
2016 Activity |
Nonvested at beginning of year | 204.2 |
Granted | 397.2 |
Vested | (174.1 | )
Forfeited | (9.5 | )
Nonvested at the end of year | 417.8 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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