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Income Tax (Tables) | 9 Months Ended
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Sep. 30, 2012
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  |  | Three months ended September 30, |  | Nine months ended September 30,
|  |  | 2012 |  | 2011 |  | 2012 |  | 2011
Tax provision at U.S. statutory rate | $ | 70,517 |  | $ | 54,739 |  | $ | 209,347 |  | $ | 199,612
Increase (decrease) in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
| Foreign tax rate differing from U.S. tax rate |  | (3,174) |  |  | (4,382) |  |  | (10,063) |  |  | (9,583)
| Differences in tax basis in foreign jurisdictions |  | (5,073) |  |  | (1,604) |  |  | (7,991) |  |  | (4,550)
| Subpart F income |  | 943 |  |  | -- |  |  | 6,015 |  |  | --
| Travel and entertainment |  | 111 |  |  | 147 |  |  | 350 |  |  | 396
| Deferred tax valuation allowance |  | 105 |  |  | -- |  |  | 250 |  |  | 795
| Amounts related to audit contingencies |  | (747) |  |  | 984 |  |  | 1,276 |  |  | 4,499
| Change in cash surrender value of insurance policies |  | (164) |  |  | 756 |  |  | (907) |  |  | 173
| Canadian corporate rate reduction |  | 330 |  |  | (30,687) |  |  | (1,319) |  |  | (30,687)
| Prior year tax adjustment |  | (4,869) |  |  | 1,778 |  |  | (6,013) |  |  | 1,784
| Other, net |  | (975) |  |  | 63 |  |  | (1,715) |  |  | 415
|  | Total provision for income taxes | $ | 57,004 |  | $ | 21,794 |  | $ | 189,230 |  | $ | 162,854
Effective tax rate |  | 28.3% |  |  | 13.9% |  |  | 31.6% |  |  | 28.6%

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 12 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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