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Capital Stock (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2010 Colombian Partners [Member] | Dec. 31, 2011 Employee Stock Option [Member] | Dec. 31, 2009 Employee Stock Option [Member] | Dec. 31, 2011 2008 Grant [Member] | Dec. 31, 2010 2008 Grant [Member] | Dec. 31, 2010 2009 Grant [Member] | Dec. 31, 2011 Restricted Stock Units [Member] Y | Dec. 31, 2010 Restricted Stock Units [Member] | Dec. 31, 2009 Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock Issued |  |  |  | 1,112,723 |  |  |  |  |  |  |  |
Percentage of restricted stock units vest | 100.00% |  |  |  |  |  |  |  |  |  |  |
Number of Restricted Stock Units Forfeited | 0 |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  |  | $ 3,101 | $ 3,424 | $ 759
Actual cumulative forfeitures (in units) | 19,918 |  |  |  |  |  |  |  |  |  |  |
Assumed maximum IRR for all grants | 12.50% |  |  |  |  |  |  |  |  |  |  |
Unrecognized Compensation expense related to outstanding stock options |  |  |  |  |  | 1,152 |  |  |  | 5,213 |  |
Remaining unrecognized compensation expense for outstanding options |  |  |  |  | 0 |  |  |  |  |  |  |
Compensation expense recognition period (in years) | 2 |  |  |  |  |  |  |  |  | 2 |  |
Approximate incremental compensation expense to reach internal rate of return level |  |  |  |  |  |  |  | 823 | 377 |  |  |
Percentage of IRR expected restricted stock units grants |  |  |  |  |  |  | 12.50% |  | 12.50% |  |  |
Number of hypothetical shares of common stock | 153,727 | 396,429 | 303,168 |  |  |  |  |  |  | 1,037,770 |  |
Treasury Stock and Share Based Awards (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased value as result of restricted stock forfeitures and canceled | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Stock options were exercised range Lower | $ 14.85 |  |  |  |  |  |  |  |  |  |  |
Stock options were exercised range Upper | $ 15.17 |  |  |  |  |  |  |  |  |  |  |
Number of Restricted Units Vested During Period | 0 |  |  |  |  |  |  |  |  |  |  |
Market Value of Restricted Shares | $ 19.60 |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised | 699 | 9,836 | 28,083 |  |  |  |  |  |  |  |  |
Recognized tax benefit on options exercised | 238 | 2,680 | 7,545 |  |  |  |  |  |  |  |  |
Average remaining contractual life of options outstanding | 3 |  |  |  |  |  |  |  |  |  |  |
Shares of Restricted Stock Granted | 424,436 | 683,921 | 472,881 |  |  |  |  |  |  |  |  |
Minimum fair value of restricted stock granted | $ 19.35 |  |  |  |  |  |  |  |  |  |  |
Maximum fair value of restricted stock granted | $ 20.71 |  |  |  |  |  |  |  |  |  |  |
Minimum forfeiture rate for restricted stock awards | 0.00% |  |  |  |  |  |  |  |  |  |  |
Maximum forfeiture rate for restricted stock awards | 5.00% |  |  |  |  |  |  |  |  |  |  |
Award vesting period range for restricted stock granted to directors | Over one year |  |  |  |  |  |  |  |  |  |  |
Incremental compensation expense |  | 435 |  |  |  |  |  |  |  |  |  |
Award vesting period range for restricted stock granted to employees | 4 years |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to restricted stock awards | 6,591 | 4,928 | 2,393 |  |  |  |  |  |  |  |  |
Unrecognized Compensation expense related to restricted stock awards | 13,688 |  |  |  |  |  |  |  |  |  |  |
Total fair value of vested shares | 5,658 | 3,272 | 762 |  |  |  |  |  |  |  |  |
Tax benefit recognized on vested shares | $ 2,188 | $ 1,087 | $ 287 |  |  |  |  |  |  |  |  |
Percentage of IRR, which is the threshold | 8.50% |  |  |  |  |  |  |  |  |  |  |
Percentage of IRR, which is the target | 10.50% |  |  |  |  |  |  |  |  |  |  |
Percentage of IRR, which is the maximum | 12.50% |  |  |  |  |  |  |  |  |  |  |

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