Business Segment Information (Summary Of Financial Data By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 201,696	[1]	$ 217,110	[1]	$ 197,461	[1]	$ 229,842	[1]	$ 200,113	[2]	$ 213,278	[2]	$ 165,861	[2]	$ 122,748	[2]	$ 846,109	$ 702,000	$ 774,469
Income (loss) from operations																	(68,483)	63,040	51,079
Net interest expense and other																	65,912	73,642	66,638
Equity in earnings of investments																	8,434	22,215	19,469
Income (loss) before income taxes																	(125,961)	1,050	1,670
Income tax provision (benefit)																	(59,158)	(36,806)	19,166
Total assets	3,386,580								3,582,347								3,386,580	3,582,347	3,592,020
Capital expenditures																	323,039	100,154	122,218
Depreciation and amortization																	97,201	91,188	81,878
Contracting Services [Member]
Segment Reporting Information [Line Items]
Revenues																	899,793	738,235	780,339
Income (loss) from operations																	(7,702)	107,013	77,391
Net interest expense and other																	702	765	1,299
Income (loss) before income taxes																	(8,529)	97,798	72,459
Income tax provision (benefit)																	(15,707)	29,235	42,828
Total assets	1,982,822								2,023,251								1,982,822	2,023,251	1,872,141
Capital expenditures																	322,216	69,259	65,949
Depreciation and amortization																	77,442	73,291	66,333
Production Facilities [Member]
Segment Reporting Information [Line Items]
Revenues																	80,091	75,460	117,300
Income (loss) from operations																	40,082	38,404	63,863
Net interest expense and other																	365	442	865
Income (loss) before income taxes																	48,276	58,064	86,100
Income tax provision (benefit)																	15,784	19,233	29,049
Total assets	503,531								534,776								503,531	534,776	512,990
Capital expenditures																	823	30,896	56,269
Depreciation and amortization																	16,828	14,935	9,907
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Revenues																	(133,775)	(111,695)	(123,170)
Income (loss) from operations																	(7,878)	93	(19,095)
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest expense and other																	64,845	72,435	64,474
Income (loss) before income taxes																	(165,708)	(154,812)	(156,889)
Income tax provision (benefit)																	(59,235)	(85,274)	(52,711)
Depreciation and amortization																	2,931	2,962	5,638
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total assets	900,227								1,024,320								900,227	1,024,320	1,206,889
Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations																	$ (92,985)	$ (82,470)	$ (71,080)

[1] Excludes revenues from discontinued operations of $178.1 million, $149.9 million, $119.1 million and $110.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2012.

[2] Excludes revenues from discontinued operations of $168.9 million, $172.5 million, $159.2 million and $196.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2011.