Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ (666,000)	$ 5,894,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	50,201,000	49,106,000
Loss on disposal or impairment, net	2,176,000	14,992,000
Earnings from equity method investments	(34,844,000)	(40,149,000)
Loss on issuance of common units by equity method investee	0	41,000
Loss (gain) on sale or impairment of equity method investment	0	30,644,000
Distributions from equity method investments	34,234,000	42,790,000
Amortization of debt issuance costs and discount	2,888,000	2,790,000
Loss on early extinguishment of debt	19,930,000	0
Deferred tax expense (benefit)	472,000	(18,486,000)
Non-cash equity compensation	5,560,000	5,509,000
Provision for uncollectible accounts receivable, net of recoveries	300,000	(589,000)
Foreign currency transaction loss (gain)	(1,011,000)	3,012,000
Inventory valuation adjustment	455,000	0
Changes in operating assets and liabilities (Note 11)	12,599,000	(19,417,000)
Net cash provided by operating activities	92,294,000	76,137,000
Capital expenditures	211,098,000	128,934,000
Proceeds from sale of long-lived assets	16,163,000	114,000
Contributions to equity method investments	9,627,000	3,448,000
Proceeds from sale of common units of equity method investee	0	60,483,000
Distributions in excess of equity in earnings of affiliates	13,410,000	13,778,000
Net cash used in investing activities	(191,152,000)	(58,007,000)
Debt issuance costs	(6,019,000)	0
Borrowings on credit facilities and issuance of senior notes, net of discount	550,018,000	283,500,000
Principal payments on credit facilities and other obligations	(388,730,000)	(272,881,000)
Debt extinguishment costs	(16,293,000)	0
Proceeds from issuance of common shares, net of offering costs	0	228,546,000
Distributions to noncontrolling interests	0	(21,485,000)
Repurchase of common stock for payment of statutory taxes due on equity-based compensation	(1,266,000)	(904,000)
Dividends paid	(59,493,000)	(39,720,000)
Proceeds from issuance of common stock under employee stock purchase plan	542,000	555,000
Net cash provided by financing activities	78,759,000	177,611,000
Effect of exchange rate changes on cash and cash equivalents	2,418,000	1,943,000
Change in cash and cash equivalents	(17,681,000)	197,684,000
Cash and cash equivalents at beginning of period	74,216,000	58,096,000
Cash and cash equivalents at end of period	$ 56,535,000	$ 255,780,000