Financial Information Related to Guarantor Subsidiaries (Details) (USD $) In Thousands	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2009
Current assets:
Cash and cash equivalents	$ 210,181		$ 50,727	$ 47,381		$ 206,505
Short - term investments	223,592		0
Accounts receivable, net	481,921		452,450
Income taxes receivable	0		0
Prepaid expenses	35,651		25,828
Inventory and other current assets	220,037		235,047
Intercompany interest receivable	0		0
Total current assets	1,171,382		764,052
Property, plant and equipment, net	1,440,852		1,313,150
Goodwill, net	591,715		588,000
Notes receivable	72,406		69,026
Intercompany notes receivable	0		0
Investments in subsidiaries	0		0
Equity-method investments	71,506		59,322
Intangible and other long-term assets, net	135,881		113,983
Total assets	3,483,742		2,907,533
Current liabilities:
Accounts payable	118,073		110,276
Accrued expenses	198,795		162,044
Income taxes payable	7,087		2,475
Deferred income taxes	12,214		29,353
Current portion of decommissioning liabilities	17,090		16,929	25,804
Current maturities of long-term debt	396,433		184,810
Intercompany interest payable	0		0
Total current liabilities	749,692		505,887
Deferred income taxes	269,802		223,936
Decommissioning liabilities	105,372		100,787	116,116
Long-term debt, net	810,337		681,635
Intercompany notes payable	0		0
Intercompany payables/(receivables)	0		0
Other long-term liabilities	113,348		114,737
Stockholders' equity:
Preferred stock of $.01 par value
Common stock of $.001 par value	80		79
Additional paid in capital	444,186		415,278
Accumulated other comprehensive income (loss), net	(23,161)	(17,134)	(25,700)	(21,121)	(31,464)	(18,996)
Retained earnings (accumulated deficit)	1,014,086		890,894
Total stockholders' equity	1,435,191		1,280,551
Total liabilities and stockholders' equity	3,483,742		2,907,533
Parent [Member]
Current assets:
Cash and cash equivalents	0		0	0		0
Short - term investments	0		0
Accounts receivable, net	0		0
Income taxes receivable	0		0
Prepaid expenses	62		18
Inventory and other current assets	0		0
Intercompany interest receivable	0		0
Total current assets	62		18
Property, plant and equipment, net	0		0
Goodwill, net	0		0
Notes receivable	0		0
Intercompany notes receivable	0		0
Investments in subsidiaries	124,271		124,271
Equity-method investments	0		0
Intangible and other long-term assets, net	0		0
Total assets	124,333		124,289
Current liabilities:
Accounts payable	0		0
Accrued expenses	140		153
Income taxes payable	11,242		4,499
Deferred income taxes	12,214		29,353
Current portion of decommissioning liabilities	0		0
Current maturities of long-term debt	0		0
Intercompany interest payable	0		0
Total current liabilities	23,596		34,005
Deferred income taxes	257,553		211,173
Decommissioning liabilities	0		0
Long-term debt, net	0		0
Intercompany notes payable	0		0
Intercompany payables/(receivables)	(98,268)		(100,882)
Other long-term liabilities	8,260		8,260
Stockholders' equity:
Preferred stock of $.01 par value			0
Common stock of $.001 par value	80		79
Additional paid in capital	444,187		415,278
Accumulated other comprehensive income (loss), net	0		0
Retained earnings (accumulated deficit)	(511,075)		(443,624)
Total stockholders' equity	(66,808)		(28,267)
Total liabilities and stockholders' equity	124,333		124,289
Issuer [Member]
Current assets:
Cash and cash equivalents	153,526		0	291		171,903
Short - term investments	223,592		0
Accounts receivable, net	1,486		415
Income taxes receivable	0		0
Prepaid expenses	7,099		4,128
Inventory and other current assets	1,579		1,678
Intercompany interest receivable	35,516		15,883
Total current assets	422,798		22,104
Property, plant and equipment, net	2,871		3,189
Goodwill, net	0		0
Notes receivable	0		0
Intercompany notes receivable	501,598		456,280
Investments in subsidiaries	595,029		602,461
Equity-method investments	69,674		43,947
Intangible and other long-term assets, net	28,243		22,455
Total assets	1,620,213		1,150,436
Current liabilities:
Accounts payable	3,699		6,654
Accrued expenses	54,568		42,821
Income taxes payable	0		0
Deferred income taxes	0		0
Current portion of decommissioning liabilities	0		0
Current maturities of long-term debt	395,623		184,000
Intercompany interest payable	0		0
Total current liabilities	453,890		233,475
Deferred income taxes	0		0
Decommissioning liabilities	0		0
Long-term debt, net	798,196		669,089
Intercompany notes payable	0		0
Intercompany payables/(receivables)	963,278		760,164
Other long-term liabilities	31,117		37,537
Stockholders' equity:
Preferred stock of $.01 par value			0
Common stock of $.001 par value	0		0
Additional paid in capital	124,271		124,271
Accumulated other comprehensive income (loss), net	0		0
Retained earnings (accumulated deficit)	(750,539)		(674,100)
Total stockholders' equity	(626,298)		(549,829)
Total liabilities and stockholders' equity	1,620,213		1,150,436
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	5,045		5,493	1,063		4,871
Short - term investments	0		0
Accounts receivable, net	405,564		382,935
Income taxes receivable	0		0
Prepaid expenses	11,966		8,948
Inventory and other current assets	205,449		222,822
Intercompany interest receivable	0		0
Total current assets	628,024		620,198
Property, plant and equipment, net	1,046,722		957,561
Goodwill, net	446,947		447,467
Notes receivable	72,406		69,026
Intercompany notes receivable	0		0
Investments in subsidiaries	0		4,347
Equity-method investments	0		0
Intangible and other long-term assets, net	77,870		61,722
Total assets	2,271,969		2,160,321
Current liabilities:
Accounts payable	77,672		71,790
Accrued expenses	104,140		91,451
Income taxes payable	0		0
Deferred income taxes	0		0
Current portion of decommissioning liabilities	17,090		16,929
Current maturities of long-term debt	0		0
Intercompany interest payable	0		0
Total current liabilities	198,902		180,170
Deferred income taxes	0		0
Decommissioning liabilities	105,372		100,787
Long-term debt, net	0		0
Intercompany notes payable	0		0
Intercompany payables/(receivables)	(215,454)		(1,407)
Other long-term liabilities	27,065		19,427
Stockholders' equity:
Preferred stock of $.01 par value			4,347
Common stock of $.001 par value	0		0
Additional paid in capital	0		0
Accumulated other comprehensive income (loss), net	0		0
Retained earnings (accumulated deficit)	2,156,084		1,856,997
Total stockholders' equity	2,156,084		1,861,344
Total liabilities and stockholders' equity	2,271,969		2,160,321
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	51,610		45,234	46,027		29,731
Short - term investments	0		0
Accounts receivable, net	111,426		99,010
Income taxes receivable	4,155		2,024
Prepaid expenses	16,524		12,734
Inventory and other current assets	13,009		10,547
Intercompany interest receivable	0		0
Total current assets	196,724		169,549
Property, plant and equipment, net	391,259		352,400
Goodwill, net	144,768		140,533
Notes receivable	0		0
Intercompany notes receivable	0		0
Investments in subsidiaries	0		4,347
Equity-method investments	1,832		15,375
Intangible and other long-term assets, net	29,768		29,806
Total assets	764,351		712,010
Current liabilities:
Accounts payable	73,842		64,636
Accrued expenses	39,947		27,619
Income taxes payable	0		0
Deferred income taxes	0		0
Current portion of decommissioning liabilities	0		0
Current maturities of long-term debt	810		810
Intercompany interest payable	35,516		15,883
Total current liabilities	150,115		108,948
Deferred income taxes	12,249		12,763
Decommissioning liabilities	0		0
Long-term debt, net	12,141		12,546
Intercompany notes payable	501,598		456,280
Intercompany payables/(receivables)	(114,620)		(125,246)
Other long-term liabilities	46,906		49,513
Stockholders' equity:
Preferred stock of $.01 par value			4,347
Common stock of $.001 par value	403		176
Additional paid in capital	59,104		66,762
Accumulated other comprehensive income (loss), net	(23,161)		(25,700)
Retained earnings (accumulated deficit)	119,616		151,621
Total stockholders' equity	155,962		197,206
Total liabilities and stockholders' equity	764,351		712,010
Consolidation, Eliminations [Member]
Current assets:
Cash and cash equivalents	0		0
Short - term investments	0		0
Accounts receivable, net	(36,555)		(29,910)
Income taxes receivable	(4,155)		(2,024)
Prepaid expenses	0		0
Inventory and other current assets	0		0
Intercompany interest receivable	(35,516)		(15,883)
Total current assets	(76,226)		(47,817)
Property, plant and equipment, net	0		0
Goodwill, net	0		0
Notes receivable	0		0
Intercompany notes receivable	(501,598)		(456,280)
Investments in subsidiaries	(719,300)		(735,426)
Equity-method investments	0		0
Intangible and other long-term assets, net	0		0
Total assets	(1,297,124)		(1,239,253)
Current liabilities:
Accounts payable	(37,140)		(32,804)
Accrued expenses	0		0
Income taxes payable	(4,155)		(2,024)
Deferred income taxes	0		0
Current portion of decommissioning liabilities	0		0
Current maturities of long-term debt	0		0
Intercompany interest payable	(35,516)		(15,883)
Total current liabilities	(76,811)		(50,711)
Deferred income taxes	0		0
Decommissioning liabilities	0		0
Long-term debt, net	0		0
Intercompany notes payable	(501,598)		(456,280)
Intercompany payables/(receivables)	(534,936)		(532,629)
Other long-term liabilities	0		0
Stockholders' equity:
Preferred stock of $.01 par value			(8,694)
Common stock of $.001 par value	(403)		(176)
Additional paid in capital	(183,376)		(191,033)
Accumulated other comprehensive income (loss), net	0		0
Retained earnings (accumulated deficit)	0		0
Total stockholders' equity	(183,779)		(199,903)
Total liabilities and stockholders' equity	$ (1,297,124)		$ (1,239,523)