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Financial Information by Geographic Area Data | 3 Months Ended
--- | ---
Jun. 30, 2012
Segments, Geographical Areas [Abstract] |
12. Industry Segment and Geographic Area Data | 12. 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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