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Equity-based compensation Plan (Equity-Based Compensation Plan) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding RollForward |  |  |
Number of options - Beginning of period | 888,571 | 908,118 | 922,593
Number of options - Options granted | 179,225 | 193,100 | 196,000
Number of options - Options exercises | (112,704) | (54,397) | (34,396)
Number of options - Options forfeited | 3,569 | 158,250 | 176,079
Number of options - End of period | 951,523 | 888,571 | 908,118
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward |  |  |
Weighted Average Exercise Price - Beginning of period | $ 14.12 | $ 14.46 | $ 14.5
Weighted Average Exercise Price - Options granted | 17.44 | 16.1 | 14.52
Weighted Average Exercise Price - Options exercises | 19.78 | 11.86 | 12.65
Weighted Average Exercise Price - Options forfeited | 16.09 | 19.29 | 15.11
Weighted Average Exercise Price - End of period | $ 12.45 | $ 14.12 | $ 14.46

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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