Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 42,702	$ 93,095	$ 232,147
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	370,479	335,644	323,608
Amortization of deferred debt issuance costs and discounts	3,663	3,737	4,458
Provision for accounts receivable	(57)	(69)	508
Deferred income taxes	6,078	(2,239)	4,736
Equity in earnings of unconsolidated affiliate	(5,592)	(7,085)	(6,435)
Loss on debt retirement, net	737	10,557	10,562
(Gain) loss on disposal of fixed assets, net	(1,676)	1,942	423
Share-based compensation	2,720	5,010	3,515
Other, net	(1,222)	(120)	4,317
Changes in assets and liabilities:
Accounts receivable	(96,107)	95,882	(58,225)
Other receivables	(1,570)	2,813	203
Inventories	(29,882)	(6,912)	(34,882)
Other current assets	5,015	5,597	(6,876)
Other assets	598	(347)	1,365
Trade accounts payable	17,142	(7,539)	18,379
Accrued expenses	66,566	(21,676)	18,019
Other non-current liabilities	20,695	19,042	15,751
Net cash provided by operating activities	389,063	516,832	542,595
Cash flows from investing activities:
Purchases of property, plant and equipment	(533,512)	(466,694)	(445,669)
Proceeds from the sale of property, plant and equipment	2,727	15,823	3,125
Financing lease payment from unconsolidated affiliate	15,484	10,794	13,384
Change in restricted cash	1,693	13,046	(10,253)
Other investing activities	(6,513)	(3,503)	(5,508)
Net cash used in investing activities	(520,121)	(430,534)	(444,921)
Cash flows from financing activities:
Borrowings under revolving credit facilities	0	0	3,261
Payments under revolving credit facilities	0	0	(34,253)
Borrowings under short-term debt	30,000	26,567	15,000
Payments of short-term debt	(50,000)	(21,567)	(15,000)
Proceeds from issuance of long-term debt	637,528	387,512	611,007
Proceeds from issuance of long-term debt, related party	0	75,000	0
Payments of long-term debt, net of certain redemption premiums and discounts	(420,116)	(392,191)	(663,433)
Payments for debt issuance costs	(6,007)	(5,875)	(7,487)
Payments for repurchase of common stock	(80,946)	(128,368)	0
Proceeds from issuance of stock through share-based compensation plans	182	821	1,048
Payments of tax withholding for restricted shares	(609)	(776)	0
Net cash provided by (used in) financing activities	110,032	(58,877)	(89,857)
Effect of exchange rate fluctuations on cash and cash equivalents	(557)	2,212	1,775
Net (decrease) increase in cash and cash equivalents	(21,583)	29,633	9,592
Cash and cash equivalents, beginning of period	434,631	404,998	395,406
Cash and cash equivalents, end of period	413,048	434,631	404,998
Cash paid during the period for:
Interest	86,138	81,280	96,642
Income taxes	8,199	16,380	5,906
Non-cash investing activities:
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	$ 0	$ 100,000	$ 0