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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule Of Share Based Compensation Performance Shares And Time Based Award Activity [Table Text Block] | The following table summarizes information about time based and financial performance-based restricted stock and restricted stock unit awards granted under the 2005 Incentive Plan, 2008 Key Partner Incentive Plan and 2011 Stock Incentive Plan:
| Performance Based Awards |  | Time Based Awards |
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |
Balance at December 31, 2009 |  | 557,958 |  | $ | 8.17 |  |  | 924,160 |  | $ | 7.33 |
Granted |  | 753,209 |  |  | 8.83 |  |  | 258,223 |  |  | 10.28 |
Vested |  | (804,300) |  |  | 8.37 |  |  | (562,971) |  |  | 8.60 |
Forfeited |  | (4,944) |  |  | 8.88 |  |  | (3,345) |  |  | 8.13 |
Balance at December 31, 2010 |  | 501,923 |  | $ | 8.83 |  |  | 616,067 |  | $ | 7.40 |
Granted |  | 1,097,754 |  |  | 18.39 |  |  | 297,520 |  |  | 16.93 |
Vested |  | (217,697) |  |  | 12.74 |  |  | (287,234) |  |  | 5.17 |
Forfeited |  | (1,423) |  |  | 14.59 |  |  | (41,454) |  |  | 8.79 |
Balance at December 31, 2011 |  | 1,380,557 |  | $ | 15.81 |  |  | 584,899 |  | $ | 12.86 |
Granted |  | 753,896 |  |  | 13.05 |  |  | 250,237 |  |  | 11.67 |
Vested |  | (1,747,987) |  |  | 14.44 |  |  | (263,458) |  |  | 12.25 |
Forfeited |  | (29,946) |  |  | 15.66 |  |  | (14,720) |  |  | 14.82 |
Balance at December 31, 2012 |  | 356,520 |  | $ | 16.09 |  |  | 556,958 |  | $ | 12.72 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Information related to share option transactions grant under all plans over the past three years is summarized as follows:
|  | Options Outstanding |  | Options Exercisable |  |  |  |
|  | Number Outstanding |  | Weighted Average Price per Share |  | Number Outstanding |  | Weighted Average Price per Share |  | Non Vested Options |
Balance at December 31, 2009 |  |  | 239,992 |  | $ | 9.55 |  |  | 194,992 |  | $ | 9.64 |  |  | 45,000 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | (20,000) |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Exercised |  |  | (6,495) |  |  | 9.19 |  |  |  |  |  |  |  |  | — |
Expired and cancelled |  |  | (17,297) |  |  | 17.08 |  |  |  |  |  |  |  |  | — |
Balance at December 31, 2010 |  |  | 216,200 |  | $ | 9.41 |  |  | 191,200 |  | $ | 9.41 |  |  | 25,000 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | (20,000) |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Exercised |  |  | (113,085) |  |  | 8.94 |  |  |  |  |  |  |  |  | — |
Expired and cancelled |  |  | (15,034) |  |  | 12.57 |  |  |  |  |  |  |  |  | — |
Balance at December 31, 2011 |  |  | 88,081 |  | $ | 9.12 |  |  | 83,081 |  | $ | 9.14 |  |  | 5,000 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | (5,000) |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Exercised |  |  | (3,153) |  |  | 8.69 |  |  |  |  |  |  |  |  | — |
Expired and cancelled |  |  | (9,928) |  |  | 7.79 |  |  |  |  |  |  |  |  | — |
Balance at December 31, 2012 |  |  | 75,000 |  | $ | 9.53 |  |  | 75,000 |  | $ | 9.53 |  |  | — |
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] | SAR’s granted and outstanding are as follows:
|  | SAR’s Outstanding |  | SAR’s Exercisable |  |  |  |
|  | Weighted Average Number Outstanding |  | Weighted Average Price per Share |  | Number Outstanding |  | Price per Share |  | Non Vested SAR’s |
Balance at December 31, 2009 |  |  | 3,518,769 |  | $ | 3.80 |  |  | 30,000 |  | $ | 8.18 |  |  | 3,488,769 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | (1,747,034) |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Exercised |  |  | (187,666) |  | $ | 4.19 |  |  |  |  |  |  |  |  | (187,666) |
Expired and cancelled |  |  | — |  |  |  |  |  |  |  |  |  |  |  | — |
Balance at December 31, 2010 |  |  | 3,331,103 |  | $ | 3.78 |  |  | 1,777,034 |  | $ | 3.77 |  |  | 1,554,069 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | (290,089) |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (172,974) |  |  | 4.23 |  |  |  |  |  |  |  |  | (172,974) |
Expired and cancelled |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Balance at December 31, 2011 |  |  | 3,158,129 |  | $ | 3.75 |  |  | 2,067,123 |  | $ | 3.75 |  |  | 1,091,006 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | (1,047,026) |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Exercised |  |  | (69,365) |  |  | 4.41 |  |  |  |  |  |  |  |  | (43,980) |
Expired and cancelled |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Balance at December 31, 2012 |  |  | 3,088,764 |  | $ | 3.74 |  |  | 3,088,764 |  | $ | 3.74 |  |  | — |
Schedule Of Share Based Compensation Equity Value Appreciation Awards Activity [Table Text Block] | Information related to EVAR transactions over the past three years is summarized as follows:
|  | EVARs Outstanding |  | EVARs Exercisable |  |  |  |
|  | Number Outstanding |  | Weighted Average Issuance Price per Share |  | Number Outstanding |  | Weighted Average Issuance Price per Share |  | Non Vested EVARs |
Balance at December 31, 2010 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Granted |  |  | 1,413,000 |  |  | 23.00 |  |  | — |  |  | — |  |  | 1,413,000 |
Expired and cancelled |  |  | (45,000) |  |  | 23.00 |  |  | — |  |  | — |  |  | (45,000) |
Balance at December 31, 2011 |  |  | 1,368,000 |  | $ | 23.00 |  |  | — |  | $ | — |  |  | 1,368,000 |
Vested |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |  |  | — |
Expired and cancelled |  |  | (90,000) |  |  | 23.00 |  |  | — |  |  | — |  |  | (90,000) |
Balance at December 31, 2012 |  |  | 1,278,000 |  | $ | 23.00 |  |  | — |  | $ | — |  |  | 1,278,000 |
Employee Stock Option [Member] |
Schedule of Share-based Compensation, Activity [Table Text Block] | Share options outstanding as of December 31, 2012 are summarized as follows:
|  | Options Outstanding |  | Options Exercisable |
Range of Exercise Prices |  | Outstanding Number |  | Weighted Average Contractual Life |  | Weighted Average Price per Share |  | Exercisable Number |  | Weighted Average Price per Share |  | Weighted Average Contractual Life |
$8.75 – $8.95 |  |  | 75,000 |  |  | 3.75 |  | $ | 9.53 |  |  | 75,000 |  | $ | 9.53 |  |  | 3.75 |
Stock Appreciation Rights (SARs) [Member] |
Schedule of Share-based Compensation, Activity [Table Text Block] |
|  | SAR’s Outstanding |  | SAR’s Exercisable |
Range of Exercise Prices |  | Outstanding Number |  | Weighted Average Contractual Life |  | Weighted Average Price per Share |  | Exercisable Number |  | Weighted Average Price per Share |  | Weighted Average Contractual Life |
$3.72 – $8.94 |  |  | 3,078,764 |  |  | 1.17 |  | $ | 3.72 |  |  | 3,078,764 |  | $ | 3.72 |  |  | 1.17 |
$8.75 – $8.95 |  |  | 10,000 |  |  | 3.33 |  | $ | 8.95 |  |  | 10,000 |  | $ | 8.95 |  |  | 3.33 |

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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 equity value appreciation awards or share units that were granted, exercised or converted, forfeited, and expired during the year. + References No definition available. + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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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