Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 11,582	$ 25,766
Depreciation and amortization	88,446	83,442
Other operating activities and non-cash items	(1,772)	4,896
Changes in assets and liabilities	(42,150)	6,123
Net cash provided by operating activities	56,106	120,227
Cash flows from investing activities:
Purchases of property, plant and equipment	(121,087)	(113,881)
Proceeds from the sale of property, plant and equipment	621	278
Financing lease payment from unconsolidated affiliate	7,914	3,020
Other investing activities	1,683	(1,057)
Net cash used in investing activities	(110,869)	(111,640)
Cash flows from financing activities:
Borrowings under short-term debt	20,000	15,000
Payments of short-term debt	(15,000)	(15,000)
Proceeds from issuance of long-term debt	158,742	0
Payments of long-term debt	(156,357)	(20,413)
Payments for repurchase of common stock	(4,505)	0
Proceeds from issuance of stock through share-based compensation plans	69	627
Payments of tax withholding for restricted shares	(353)	(696)
Net cash provided by (used in) financing activities	2,596	(20,482)
Effect of exchange rate fluctuations on cash and cash equivalents	(1,332)	(152)
Net decrease in cash and cash equivalents	(53,499)	(12,047)
Cash and cash equivalents, beginning of period	434,631	404,998
Cash and cash equivalents, end of period	381,132	392,951
Non cash investing and financing activities:
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	$ 0	$ 100,000