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Industry Segment and Geographic Area Data (Table Text Block) | 3 Months Ended
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Jun. 30, 2012
Geographic Areas, Long-Lived Assets [Abstract] |
Industry segment and geographic area data |
|  | United States |  |  | Canada |  |  | Consolidated |
|  | (Unaudited) |
|  | (All amounts are in thousands of U.S. $'s) |
Quarter ended June 30, 2012 |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 623,923 |  |  | $ | 41,493 |  |  | $ | 665,416 |
Depreciation and amortization, net of (gains) losses on disposals |  |  | 56,963 |  |  |  | 1,973 |  |  |  | 58,936 |
Interest expense |  |  | 23,339 |  |  |  | 152 |  |  |  | 23,491 |
Pretax earnings |  |  | 119,384 |  |  |  | 8,004 |  |  |  | 127,388 |
Income tax expense |  |  | 44,698 |  |  |  | 2,121 |  |  |  | 46,819 |
Identifiable assets |  |  | 4,690,153 |  |  |  | 148,683 |  |  |  | 4,838,836 |
Quarter ended June 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 601,091 |  |  | $ | 41,874 |  |  | $ | 642,965 |
Depreciation and amortization, net of (gains) losses on disposals |  |  | 46,864 |  |  |  | 1,869 |  |  |  | 48,733 |
Interest expense |  |  | 22,470 |  |  |  | 163 |  |  |  | 22,633 |
Pretax earnings |  |  | 118,357 |  |  |  | 7,373 |  |  |  | 125,730 |
Income tax expense |  |  | 45,329 |  |  |  | 2,178 |  |  |  | 47,507 |
Identifiable assets |  |  | 4,026,330 |  |  |  | 148,126 |  |  |  | 4,174,456 |

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- Definition Tabular disclosure of the names of foreign countries in which material long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets are located, and amount of such long-lived assets located in that country or foreign geographic area. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 38 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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