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2012 Incentive compensation plan (Tables) | 6 Months Ended
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Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Restricted Stock Unit Activity | Restricted stock activity consisted of the following for the six months ended June 30, 2014:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
December 31, 2013 |  |  | 162,993 |  |  | $ | 39.29 |
Granted |  |  | 12,000 |  |  |  | 76.93 |
Forfeited |  |  | 3,000 |  |  |  | 51.91 |
Vested |  |  | 15,227 |  |  |  | 37.61 |
June 30, 2014 |  |  | 156,766 |  |  | $ | 42.10 |

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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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