Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 126,653	$ 215,476	$ 177,688
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	155,529	153,222	131,876
Loss on early debt extinguishment	1,073	23,121	0
Non-cash foreign currency (gain) loss on debt	37,724	(30,912)	(14,771)
Non-cash equity based compensation expense	11,243	13,434	11,878
Non-cash deferred income tax expense (benefit)	11,259	(35,770)	10,662
Other non-cash expenses	16,146	13,516	13,300
Change in operating assets and liabilities:
(Increase) decrease in receivables	(13,975)	(2,195)	(5,887)
(Increase) decrease in inventories	(1,203)	(3,332)	(1,208)
(Increase) decrease in other assets	148	(40)	(53)
Increase (decrease) in accounts payable	549	1,906	(407)
Increase (decrease) in deferred revenue	21,564	2,964	13,099
Increase (decrease) in accrued interest	(25)	(2,002)	13
Increase (decrease) in accrued taxes	(13,842)	(15,398)	16,888
Increase (decrease) in accrued salaries and wages	149	(8,004)	5,804
Increase (decrease) in self-insurance reserves	(959)	(2,055)	3,026
Increase (decrease) in other liabilities	(1,293)	7,248	(3,561)
Net cash from operating activities	350,740	331,179	358,347
CASH FLOWS FOR INVESTING ACTIVITIES
Capital expenditures	(189,775)	(188,084)	(160,656)
Sale of preferred equity investment	112	3,281	0
Purchase of identifiable intangible assets	(41)	(66)	(577)
Net cash for investing activities	(189,704)	(184,869)	(161,233)
CASH FLOWS FOR FINANCING ACTIVITIES
Term debt borrowings	0	750,000	0
Note borrowings	0	500,000	0
Term debt payments	0	(617,850)	(6,000)
Note payments, including amounts paid for early termination	0	(515,458)	0
Distributions paid to partners	(203,199)	(194,756)	(187,182)
Payment of debt issuance costs and original issue discount	(2,543)	(19,809)	0
Exercise of limited partnership unit options	125	65	0
Tax effect of units involved in treasury unit transactions	(2,530)	(4,440)	(422)
Payments related to tax withholding for equity compensation	(8,428)	(4,173)	(920)
Net cash for financing activities	(216,575)	(106,421)	(194,524)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(5,357)	3,640	569
Net increase (decrease) for the year	(60,896)	43,529	3,159
Balance, beginning of year	166,245	122,716	119,557
Balance, end of year	105,349	166,245	122,716
SUPPLEMENTAL INFORMATION
Net cash payments for interest expense	84,947	85,975	82,015
Interest capitalized	2,864	2,524	2,331
Cash payments for income taxes, net of refunds	42,159	55,989	44,502
Capital expenditures in accounts payable	$ 5,083	$ 5,365	$ 5,425