Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 35,030	$ 67,534
Depreciation and amortization	272,891	249,543
Loss on debt retirement, net	0	10,557
Other operating activities and non-cash items	(724)	1,537
Changes in assets and liabilities	(22,761)	46,621
Net cash provided by operating activities	284,436	375,792
Cash flows from investing activities:
Purchases of property, plant and equipment	(380,344)	(324,349)
Proceeds from the sale of property, plant and equipment	3,759	15,333
Financing lease payment from unconsolidated affiliate	13,684	7,741
Other investing activities	1,451	(5,654)
Net cash used in investing activities	(361,450)	(306,929)
Cash flows from financing activities:
Borrowings under short-term debt	30,000	26,567
Payments of short-term debt	(40,000)	(21,567)
Proceeds from issuance of long-term debt	562,528	348,236
Proceeds from issuance of long-term debt, related party	0	75,000
Payments of long-term debt, net of certain redemption premiums and discounts	(272,976)	(373,655)
Payments for debt issuance costs	(6,007)	(5,875)
Payments for repurchase of common stock	(80,946)	(41,543)
Proceeds from issuance of stock through share-based compensation plans	181	933
Payments of tax withholding for restricted shares	(546)	(793)
Net cash provided by financing activities	192,234	7,303
Effect of exchange rate fluctuations on cash and cash equivalents	(766)	2,226
Net increase in cash and cash equivalents	114,454	78,392
Cash and cash equivalents, beginning of period	434,631	404,998
Cash and cash equivalents, end of period	549,085	483,390
Non cash investing and financing activities:
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	$ 0	$ 100,000