Note 15 - Condensed Consolidated Financial Information (Details) - Condensed Consolidating Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 358,982	$ 251,046
Capital expenditures, including capitalized interest	(240,423)	(199,983)
Acquisitions of businesses, net of cash acquired	(321)
Proceeds from dispositions of property, plant and equipment	2,633	5,225
Payments for/from equity contributions from investing activities	0	(1,715)
Other, net	94	65
Net cash provided by (used in) investing activities	(238,017)	(196,408)
Revolving credit borrowings (repayments), net	(47,901)	(951)
Term loan repayments	(92,762)	(14,944)
Debt and capital lease repayments	(209)	(2,312)
Issuance of common stock from share-based payment arrangements	10,388	7,801
Purchase of treasury stock	(1,485)
Excess tax benefits from share-based payment arrangements	5,329	6,014
Proceeds from (funding of) accounts and notes with affiliates, net	0	0
Payments for/from equity contributions from financing activities	0	0
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	(3,722)	(4,092)
Other, net	(201)	(23)
Net cash provided by (used in) financing activities	(130,563)	(8,507)
Effect of exchange rate changes on cash	(17,717)	(3,461)
Net change in cash and cash equivalents from continuing operations	(27,315)	42,670
Cash and cash equivalents, beginning of period	253,172	71,721
Cash and cash equivalents, end of period	225,857	114,391
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1,287)	0
Capital expenditures, including capitalized interest	1,287	0
Acquisitions of businesses, net of cash acquired	0
Proceeds from dispositions of property, plant and equipment	0	0
Payments for/from equity contributions from investing activities	57,876	19,782
Other, net	0	0
Net cash provided by (used in) investing activities	59,163	19,782
Revolving credit borrowings (repayments), net	0	0
Term loan repayments	0	0
Debt and capital lease repayments	0	0
Issuance of common stock from share-based payment arrangements	0	0
Purchase of treasury stock	0
Excess tax benefits from share-based payment arrangements	0	0
Proceeds from (funding of) accounts and notes with affiliates, net		0
Payments for/from equity contributions from financing activities	(57,876)	(19,782)
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(57,876)	(19,782)
Effect of exchange rate changes on cash	0	0
Net change in cash and cash equivalents from continuing operations	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(72,956)	(79,674)
Capital expenditures, including capitalized interest	(649)	(1,198)
Acquisitions of businesses, net of cash acquired	0
Proceeds from dispositions of property, plant and equipment	0	0
Payments for/from equity contributions from investing activities	(56,646)	(14,012)
Other, net	0	(6)
Net cash provided by (used in) investing activities	(57,295)	(15,216)
Revolving credit borrowings (repayments), net	0	5,434
Term loan repayments	(10,000)	(10,000)
Debt and capital lease repayments	(11)	(11)
Issuance of common stock from share-based payment arrangements	10,388	7,801
Purchase of treasury stock	(1,485)
Excess tax benefits from share-based payment arrangements	5,329	6,014
Proceeds from (funding of) accounts and notes with affiliates, net	155,386	89,812
Payments for/from equity contributions from financing activities	0	0
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	(3,722)	(4,092)
Other, net	(203)	(23)
Net cash provided by (used in) financing activities	155,682	94,935
Effect of exchange rate changes on cash	0	0
Net change in cash and cash equivalents from continuing operations	25,431	45
Cash and cash equivalents, beginning of period	3,222	(295)
Cash and cash equivalents, end of period	28,653	(250)
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	214,478	157,589
Capital expenditures, including capitalized interest	(97,404)	(82,503)
Acquisitions of businesses, net of cash acquired	(321)
Proceeds from dispositions of property, plant and equipment	1,173	4,567
Payments for/from equity contributions from investing activities	(1,230)	(5,770)
Other, net	92	75
Net cash provided by (used in) investing activities	(97,690)	(83,631)
Revolving credit borrowings (repayments), net	0	0
Term loan repayments	0	0
Debt and capital lease repayments	(170)	(2,211)
Issuance of common stock from share-based payment arrangements	0	0
Purchase of treasury stock	0
Excess tax benefits from share-based payment arrangements	0	0
Proceeds from (funding of) accounts and notes with affiliates, net	(161,225)	(85,228)
Payments for/from equity contributions from financing activities	22,569	14,012
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	0	0
Other, net	0	1
Net cash provided by (used in) financing activities	(138,826)	(73,426)
Effect of exchange rate changes on cash	(321)	0
Net change in cash and cash equivalents from continuing operations	(22,359)	532
Cash and cash equivalents, beginning of period	57,205	1,736
Cash and cash equivalents, end of period	34,846	2,268
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	218,747	173,131
Capital expenditures, including capitalized interest	(143,657)	(116,282)
Acquisitions of businesses, net of cash acquired	0
Proceeds from dispositions of property, plant and equipment	1,460	658
Payments for/from equity contributions from investing activities	0	(1,715)
Other, net	2	(4)
Net cash provided by (used in) investing activities	(142,195)	(117,343)
Revolving credit borrowings (repayments), net	(47,901)	(6,385)
Term loan repayments	(82,762)	(4,944)
Debt and capital lease repayments	(28)	(90)
Issuance of common stock from share-based payment arrangements	0	0
Purchase of treasury stock	0
Excess tax benefits from share-based payment arrangements	0	0
Proceeds from (funding of) accounts and notes with affiliates, net	5,839	(4,584)
Payments for/from equity contributions from financing activities	35,307	5,770
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	0	0
Other, net	2	(1)
Net cash provided by (used in) financing activities	(89,543)	(10,234)
Effect of exchange rate changes on cash	(17,396)	(3,461)
Net change in cash and cash equivalents from continuing operations	(30,387)	42,093
Cash and cash equivalents, beginning of period	192,745	70,280
Cash and cash equivalents, end of period	$ 162,358	$ 112,373