Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 406,815	$ 296,007	$ 318,225
Adjustments to reconcile net income to net cash provided by operating activities —
Depreciation	218,107	202,519	183,808
Amortization of intangible assets	62,091	43,994	32,205
Asset impairment charges	13,892	49,375	58,057
Change in fair value of contingent consideration liabilities	13,404	(11,248)	(5,171)
Equity in (earnings) losses of unconsolidated affiliates	(76,801)	52,867	10,945
Amortization of debt issuance costs	1,870	1,270	1,321
(Gain) loss on sale of property and equipment	(5,797)	3,296	(549)
Provision for doubtful accounts	11,249	7,169	87
Deferred income tax expense (benefit)	(7,919)	61,974	(32,130)
Non-cash stock-based compensation	52,013	52,484	46,448
Foreign currency and other (gain) loss	(5,568)	(385)	409
Changes in operating assets and liabilities, net of non-cash transactions	(156,805)	(400,533)	(241,764)
Net cash provided by operating activities	526,551	358,789	371,891
Cash Flows from Investing Activities:
Capital expenditures	(261,762)	(293,595)	(244,651)
Proceeds from sale of property and equipment	31,142	31,780	23,348
Proceeds from insurance settlements related to property and equipment	1,964	714	1,175
Cash paid for acquisitions, net of cash, cash equivalents and restricted cash acquired	(387,966)	(94,917)	(361,217)
Investments in unconsolidated affiliates and other entities	(47,056)	(36,909)	(56,528)
Cash received from investments in unconsolidated affiliates and other entities	46,590	4,705	65,789
Cash paid for intangible assets	(508)	(14,448)	0
Net cash used in investing activities	(617,596)	(402,670)	(572,084)
Cash Flows from Financing Activities:
Borrowings under credit facility	6,175,558	4,491,782	2,932,338
Payments under credit facility	(5,903,069)	(4,076,460)	(2,624,404)
Payments on other long-term debt	(2,203)	(1,298)	(5,361)
Net borrowings (repayments) of short-term debt	(28,292)	33,790	(2,783)
Debt issuance and amendment costs	(2,309)	(1,976)	(1,507)
Distributions to non-controlling interests, net of contributions received	(2,526)	(4,038)	(2,001)
Payments related to tax withholding for share-based compensation	(16,144)	(15,218)	(18,543)
Exercise of stock options	0	0	25
Payments of dividends	(23,236)	0	0
Repurchase of common stock	(20,092)	(443,152)	(50,000)
Net cash provided by (used in) financing activities	177,687	(16,570)	227,764
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(153)	(68)	1,794
Net increase (decrease) in cash, cash equivalents and restricted cash	86,489	(60,519)	29,365
Cash, cash equivalents and restricted cash, beginning of year	83,256	143,775	114,410
Cash, cash equivalents and restricted cash, end of year	$ 169,745	$ 83,256	$ 143,775