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Industry Segment and Geographic Area Data | 3 Months Ended
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Jun. 30, 2019
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, 2019 |  |  |  |  |  |
Total revenues | $ | 1,028,574 | $ | 50,675 | $ | 1,079,249
Depreciation and amortization, net of (gains) losses on disposal |  | 141,898 |  | 3,144 |  | 145,042
Interest expense |  | 38,220 |  | 668 |  | 38,888
Pretax earnings |  | 170,847 |  | 3,867 |  | 174,714
Income tax expense |  | 41,114 |  | 1,178 |  | 42,292
Identifiable assets |  | 12,076,714 |  | 398,030 |  | 12,474,744
Quarter Ended June 30, 2018 |  |  |  |  |  |
Total revenues | $ | 971,295 | $ | 48,282 | $ | 1,019,577
Depreciation and amortization, net of (gains) losses on disposal |  | 131,379 |  | 1,079 |  | 132,458
Interest expense |  | 34,549 |  | 705 |  | 35,254
Pretax earnings |  | 163,262 |  | 5,935 |  | 169,197
Income tax expense |  | 39,777 |  | 1,571 |  | 41,348
Identifiable assets |  | 10,657,222 |  | 344,262 |  | 11,001,484

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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