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Financial Information by Geographic Area Data | 3 Months Ended
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Jun. 30, 2013
Segments, Geographical Areas [Abstract] |
12. Industry Segment and Geographic Area Data | 11. Industry Segment and Geographic Area Data
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Quarter ended June 30, 2013 |  |  |  |  |  |
Total revenues | $ | 703,963 | $ | 42,868 | $ | 746,831
Depreciation and amortization, net of (gains) losses on disposals |  | 59,170 |  | 1,947 |  | 61,117
Interest expense |  | 23,186 |  | 142 |  | 23,328
Pretax earnings |  | 171,756 |  | 7,292 |  | 179,048
Income tax expense |  | 64,148 |  | 1,932 |  | 66,080
Identifiable assets |  | 5,425,667 |  | 153,095 |  | 5,578,762
Quarter ended June 30, 2012 |  |  |  |  |  |
Total revenues | $ | 626,183 | $ | 41,493 | $ | 667,676
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

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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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