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Income Tax | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Income Tax Disclosure [Abstract] |  |
Income Tax Disclosure [Text Block] | 9. Income Tax The Company's provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 35% to pre-tax income as a result of the following (dollars in thousands):
|  |  | 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%
| During the three-month and nine-month periods ended September 30, 2011, the Company recognized an income tax benefit associated with previously enacted reductions in federal statutory tax rates and adjustments to various provincial statutory tax rates in Canada. This 2007 tax rate change enactment included phased in effective dates through 2012. These adjustments in tax rates should have been recognized beginning in 2007, when the Canadian tax legislation was enacted. For the three-month and nine-month periods ended September 30, 2011, the Company recorded a cumulative tax benefit adjustment of $30.7 million in “Provision for income taxes” to correct the deferred tax liabilities that were not properly recorded. If the impact of the tax rates had been recorded in the prior years, the Company estimates that it would have recognized approximately $3.0 million, $6.0 million, $9.0 million and $12.0 million of tax benefit in the years ended 2007, 2008, 2009 and 2010, respectively, and would not have been significant in the three and nine-month periods e nded September 30, 2011.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 136, 172 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 44, 45, 46, 47, 48, 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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