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2012 Incentive compensation plan (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of SAR Awards Transactions | The Compensation Committee of the Board of Directors approved, and the Company granted the following SAR awards:
Award Description |  | Grant Date |  | Recipient |  | Award |  | Exercise Price |  | Expiration
SAR I |  | June 6, 2012 |  | Chief Operating Officer (“COO”) |  | 543,872 shares |  | $22.07 |  | June 6, 2022
SAR II |  | October 19, 2015 |  | Chief Financial Officer (“CFO”) |  | 60,000 shares |  | $24.41 |  | October 19, 2025
Summary of Restricted Stock Unit Activity | Restricted stock activity consisted of the following for the years ended December 31:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
December 31, 2013 |  |  | 162,993 |  |  | $ | 39.29 |
Granted |  |  | 23,000 |  |  |  | 71.47 |
Forfeited |  |  | (12,000 | ) |  |  | 60.44 |
Vested |  |  | (19,742 | ) |  |  | 41.89 |
December 31, 2014 |  |  | 154,251 |  |  | $ | 42.18 |
Granted |  |  | 1,000 |  |  |  | 28.48 |
Forfeited |  |  | (800 | ) |  |  | 65.51 |
Vested |  |  | (24,207 | ) |  |  | 42.63 |
December 31, 2015 |  |  | 130,244 |  |  | $ | 41.77 |

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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://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 number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards 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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