Segment Information Segments (Details) $ in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) reportable_segment provinces region	Sep. 30, 2018 AUD ($)	Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating regions | region			8
Number of reportable segments | reportable_segment			3
Noncontrolling Interest, Ownership Percentage by Parent	51.10%		51.10%
Payments of Ordinary Dividends				$ 40.0
Payments of Ordinary Dividends, Parent				20.4	$ 15,600
Distribution to noncontrolling interest			$ 0	$ (19.6)	(14,900)
Operating revenue	$ 583,694	$ 603,304	1,713,263		1,772,955
Operating income/(loss)	112,756	127,820	286,666		317,858
Depreciation and amortization	63,026	65,392	188,169		197,127
Interest expense, net	24,142	26,012	77,780		79,106
Provision for/(benefit from) income taxes	19,975	31,013	53,101		41,569
Cash expenditures for additions to property and equipment, net of grants from outside parties	74,420	57,009	$ 204,279		177,436
North American Operations [Member]
Segment Reporting Information [Line Items]
Number of operating regions | provinces			6
Operating revenue	352,442	355,709	$ 1,026,735		1,020,896
Operating income/(loss)	95,633	102,484	249,209		255,918
Depreciation and amortization	39,164	41,388	116,333		123,266
Interest expense, net	12,599	10,339	36,871		30,572
Provision for/(benefit from) income taxes	16,876	26,323	49,103		26,930
Cash expenditures for additions to property and equipment, net of grants from outside parties	53,239	42,120	153,959		129,607
Australia Operations [Member]
Segment Reporting Information [Line Items]
Operating revenue	71,600	76,703	203,238		230,566
Operating income/(loss)	19,484	20,713	43,642		62,585
Depreciation and amortization	13,779	14,937	42,382		46,232
Interest expense, net	10,694	12,780	34,618		38,914
Provision for/(benefit from) income taxes	2,641	2,398	2,711		7,120
Cash expenditures for additions to property and equipment, net of grants from outside parties	14,845	8,185	26,797		27,936
U.K./European Operations [Member]
Segment Reporting Information [Line Items]
Operating revenue	159,652	170,892	483,290		521,493
Operating income/(loss)	(2,361)	4,623	(6,185)		(645)
Depreciation and amortization	10,083	9,067	29,454		27,629
Interest expense, net	849	2,893	6,291		9,620
Provision for/(benefit from) income taxes	458	2,292	1,287		7,519
Cash expenditures for additions to property and equipment, net of grants from outside parties	$ 6,336	$ 6,704	$ 23,523		$ 19,893
MIRA [Member]
Segment Reporting Information [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	48.90%		48.90%