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Stock-based compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Share-based Payment Award, Stock Options Granted, Valuation Assumptions | The following table shows the significant assumptions used in connection with the determination of the fair value of options granted in the three months ended March 31, 2015. No options were granted in the three months ended March 31, 2016.
|  | Three months ended March 31, 2015 |
Dividend yield |  |  | — |
Expected life (in months) |  |  | 84 |
Risk free rate of interest |  |  | 1.99 | %
Volatility |  |  | 34.97 | %
Summary of Stock Option Activity | A summary of stock option activity during the three months ended March 31, 2016 is set out below:
|  | Three months ended March 31, 2016 |
|  | Shares arising out of options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |
Outstanding as of January 1, 2016 |  |  | 5,986,845 |  |  | $ | 16.99 |  |  |  | 5.8 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | (25,000 | ) |  |  | 19.35 |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (248,316 | ) |  |  | 16.96 |  |  |  | — |  |  |  | 2,539 |
Outstanding as of March 31, 2016 |  |  | 5,713,529 |  |  | $ | 16.98 |  |  |  | 5.5 |  |  | $ | 59,157 |
Vested as of March 31, 2016 and expected to vest thereafter (Note a) |  |  | 5,541,849 |  |  | $ | 16.76 |  |  |  | 5.5 |  |  | $ | 57,790 |
Vested and exercisable as of March 31, 2016 |  |  | 3,492,030 |  |  | $ | 15.34 |  |  |  | 4.3 |  |  | $ | 41,382 |
Weighted average grant date fair value of grants during the period |  | $ | — |  |  |  |  |  |  |  |  |  |  |  |  |
a) | Options expected to vest reflect an estimated forfeiture rate.
Summary of Restricted Share Units Granted | A summary of RSUs granted during the three months ended March 31, 2016 is set out below:
|  | Three months ended March 31, 2016 |
|  | Number of Restricted Share Units |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of January 1, 2016 |  |  | 157,390 |  |  | $ | 17.67 |
Granted |  |  | — |  |  |  | — |
Vested (Note a) |  |  | (5,256 | ) |  |  | 14.87 |
Forfeited |  |  | (1,135 | ) |  |  | 14.18 |
Outstanding as of March 31, 2016 |  |  | 150,999 |  |  | $ | 17.80 |
Expected to vest (Note b) |  |  | 143,800 |  |  |  |  |
(a) | RSUs that vested during the period covered were net settled upon vesting by issuing 3,228 shares (net of minimum statutory tax withholding).
(b) | The number of RSUs expected to vest reflects an estimated forfeiture rate.
Summary of Performance Units Activity | A summary of PU activity during the three months ended March 31, 2016 is set out below:
|  | Three months ended March 31, 2016 |
|  | Number of Performance Units |  |  | Weighted Average Grant Date Fair Value |  |  | Maximum Shares Eligible to Receive |
Outstanding as of January 1, 2016 |  |  | 2,499,322 |  |  | $ | 19.95 |  |  |  | 2,499,322 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Vested |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | (62,411 | ) |  |  | 19.56 |  |  |  | (62,411 | )
Adjustment upon final determination of level of performance goal achievement (Note a) |  |  | 7,274 |  |  |  | 22.72 |  |  |  |  |
Adjustment upon final determination of level of performance goal achievement (Note a) |  |  |  |  |  |  |  |  |  |  | 7,274 |
Outstanding as of March 31, 2016 |  |  | 2,444,185 |  |  | $ | 19.96 |  |  |  | 2,444,185 |
Expected to vest (Note b) |  |  | 2,211,468 |  |  |  |  |  |  |  |  |
(a) | Represents an adjustment made in March 2016 to the number of shares subject to the PUs granted in 2015 upon certification of the level of achievement of the performance targets underlying such awards.
(b) | The number of PUs expected to vest has been adjusted by an estimated forfeiture rate.

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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=6415400&loc=d3e5070-113901 + Details
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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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