Industry Segment and Geographic Area Data (Table Text Block)

3 Months Ended

9 Months Ended

Dec. 31, 2016

Dec. 31, 2016

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 December 31, 2016
Total revenues	$	757,698	$	32,978	$	790,676
Depreciation and amortization, net of (gains) losses on disposals		119,824		1,499		121,323
Interest expense		29,000		3		29,003
Pretax earnings		99,660		3,040		102,700
Income tax expense		36,678		794		37,472
Identifiable assets		8,981,335		305,982		9,287,317
Quarter ended December 31, 2015
Total revenues	$	713,416	$	31,335	$	744,751
Depreciation and amortization, net of (gains) losses on disposals		90,273		578		90,851
Interest expense		25,357		50		25,407
Pretax earnings		128,799		3,696		132,495
Income tax expense		49,776		950		50,726
Identifiable assets		7,534,725		227,809		7,762,534

		United States		Canada		Consolidated
		(Unaudited)
		(All amounts are in thousands of U.S. $'s)
Nine Months ended December 31, 2016
Total revenues	$	2,588,786	$	124,210	$	2,712,996
Depreciation and amortization, net of (gains) losses on disposals		336,618		3,921		340,539
Interest expense		83,857		5		83,862
Pretax earnings		595,217		19,605		614,822
Income tax expense		220,695		5,251		225,946
Identifiable assets		8,981,335		305,982		9,287,317
Nine Months ended December 31, 2015
Total revenues	$	2,470,785	$	121,674	$	2,592,459
Depreciation and amortization, net of (gains) losses on disposals		215,995		(663)		215,332
Interest expense		71,319		161		71,480
Pretax earnings		664,189		24,409		688,598
Income tax expense		245,797		6,368		252,165
Identifiable assets		7,534,725		227,809		7,762,534