Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss) from continuing operations including noncontrolling interest	$ (89,654,000)	$ (148,829,000)	$ 25,195,000
Net income from discontinued operations, net of income taxes		829,000	11,539,000
Net income (loss)	(89,654,000)	(148,000,000)	36,734,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	78,244,000	72,127,000	98,258,000
Amortization of debt issuance costs and debt discount	22,500,000	20,364,000	13,277,000
Loss (gain) on the disposal of assets, net	21,464,000	(3,680,000)	(150,351,000)
Goodwill impairment	24,091,000
Write-off of deferred financing fees related to extinguishment of debt			13,178,000
Deferred income taxes	(13,336,000)	(17,252,000)	(24,484,000)
Stock-based compensation	7,915,000	9,692,000	11,420,000
Loss (income) from equity method investees, net of income taxes	(21,093,000)	(2,797,000)	596,000
Distribution from equity method investments, net of income taxes	27,910,000	320,000
Other			(11,604,000)
Changes in operating assets and liabilities before effects of business combinations and dispositions:
Accounts receivable	57,060,000	(21,762,000)	43,443,000
Inventories	(21,632,000)	50,022,000	26,972,000
Derivative financial instruments	1,274,000	12,420,000	(12,294,000)
Prepaid expenses and other assets	(2,105,000)	793,000	1,907,000
Accounts payable and accrued liabilities	(22,772,000)	(1,778,000)	(53,565,000)
Current income taxes	30,073,000	3,138,000	31,517,000
Other	(1,044,000)	(288,000)	4,526,000
Net cash provided by (used in) operating activities - continuing operations	98,895,000	(27,001,000)	29,530,000
Net cash provided by operating activities - discontinued operations		17,469,000	9,437,000
Net cash provided by (used in) operating activities	98,895,000	(9,532,000)	38,967,000
Cash flows from investing activities:
Purchases of property and equipment, net	(110,579,000)	(75,481,000)	(40,529,000)
Proceeds from sale of discontinued operations, net of cash divested		76,884,000
Proceeds from the sale of assets, net	39,952,000	3,469,000	671,650,000
Disposition of equity method investee	80,500,000	29,721,000
Acquisition of businesses, net of cash acquired	(21,325,000)
Disposition from equity method investees		220,000
Contribution to equity method investees			(3,091,000)
Other investing activities			7,500,000
Net cash provided by (used in) investing activities - continuing operations	(11,452,000)	34,813,000	635,530,000
Net cash used in investing activities - discontinued operations		(4,169,000)	(128,065,000)
Net cash provided by (used in) investing activities	(11,452,000)	30,644,000	507,465,000
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	33,000,000	157,710,000	83,100,000
Payments of principal on long-term debt	(12,987,000)	(45,702,000)	(576,389,000)
Proceeds from short-term borrowings	2,392,258,000	2,802,199,000	3,479,784,000
Payments on short-term borrowings	(2,468,485,000)	(2,840,505,000)	(3,578,629,000)
Payments for repurchase of common stock	(11,479,000)	(61,646,000)	(2,978,000)
Payments of cash dividends and distributions	(9,675,000)	(31,686,000)	(41,265,000)
Proceeds from disgorgement of shareholder short-swing profits		6,699,000
Payments of loan fees	(3,873,000)	(5,291,000)	(3,808,000)
Payments related to tax withholdings for stock-based compensation	(1,288,000)	(2,320,000)	(3,569,000)
Proceeds from exercises of stock options		1,595,000	150,000
Net cash used in financing activities - continuing operations	(82,529,000)	(18,947,000)	(643,604,000)
Net cash provided by (used in) financing activities - discontinued operations		(50,464,000)	103,007,000
Net cash used in financing activities	(82,529,000)	(69,411,000)	(540,597,000)
Net change in cash, cash equivalents and restricted cash	4,914,000	(48,299,000)	5,835,000
Cash, cash equivalents and restricted cash, beginning of period	269,896,000	283,284,000	289,667,000
Discontinued operations cash activity included above:
Add: Cash balance included in current assets of discontinued operations at beginning of period		34,911,000	22,693,000
Less: Cash balance included in current assets of discontinued operations at end of period			34,911,000
Cash, cash equivalents and restricted cash, end of period	274,810,000	269,896,000	283,284,000
Discontinued operations cash activity included above:
Less: Cash, cash equivalents and restricted cash balance included in current assets of discontinued operations at end of period		34,911,000	22,693,000
Total cash, cash equivalents and restricted cash	274,810,000	283,284,000	289,667,000
Non-cash financing activity:
Settlement of NMTC transaction		8,100,000
Modification of 3.25% convertible notes due 2019			3,480,000
Exchange of common stock held in treasury stock for 3.25% convertible notes due 2018			1,000
Supplemental investing and financing activities:
Assets acquired in acquisitions, net of cash	42,443,000		124,525,000
Less: liabilities assumed	(14,451,000)		(118,000)
Less: noncontrolling interests assumed	(6,667,000)
Net assets acquired	21,325,000		124,407,000
Assets disposed of in sale	67,711,000	527,614,000	550,648,000
Less: liabilities disposed	(6,234,000)	(373,846,000)	(41,276,000)
Net assets disposed	61,477,000	153,768,000	509,372,000
Supplemental disclosures of cash flow:
Cash paid (refunded) for income taxes	(60,587,000)	563,000	(22,478,000)
Cash paid for interest of continuing operations	$ 23,300,000	24,287,000	60,664,000
Cash paid for interest of discontinued operations		$ 11,557,000	$ 12,481,000