Quarterly Financial Information (Summary Of Consolidated Quarterly Financial Information) (Details) (USD $)	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
Quarterly Financial Information [Line Items]
Net revenues	$ 201,696,000	[1]	$ 217,110,000	[1]	$ 197,461,000	[1]	$ 229,842,000	[1]	$ 200,113,000	[2]	$ 213,278,000	[2]	$ 165,861,000	[2]	$ 122,748,000	[2]	$ 846,109,000	$ 702,000,000	$ 774,469,000
Gross profit (loss)	(108,925,000)	[3]	57,919,000	[3]	28,438,000	[3]	72,483,000	[3]	26,273,000	[4]	64,972,000	[4]	44,043,000	[4]	14,395,000	[4]	49,915,000	149,683,000	164,817,000
Net income	(171,560,000)		14,875,000		44,651,000		65,737,000		16,763,000	[5]	46,026,000	[5]	41,323,000	[5]	25,867,000	[5]	(46,297,000)	129,979,000	(126,988,000)
Impairment of Long-Lived Assets Held-for-use	158,000,000		4,600,000		14,600,000
Other than temporary loss on equity investments																		10,563,000	2,240,000
Net income (loss) applicable to common shareholders:
Income (loss) from continuing operations	(99,679,000)		10,362,000		2,425,000		16,874,000		17,487,000		15,999,000		10,547,000		(9,315,000)		(70,018,000)	34,291,000	(20,445,000)
Income (loss) from discontinued operations	(71,888,000)	[6]	4,503,000	[6]	42,216,000	[6]	48,853,000	[6]	(734,000)		30,017,000		30,766,000		35,172,000		23,684,000	95,221,000	(106,657,000)
Net income applicable to common shareholders	(171,567,000)		14,865,000		44,641,000		65,727,000		16,753,000		46,016,000		41,313,000		25,857,000		(46,334,000)	129,939,000	(127,102,000)
Basic earnings (loss) per common share:
Continuing operations	$ (0.95)		$ 0.10		$ 0.02		$ 0.16		$ 0.17		$ 0.15		$ 0.10		$ (0.09)		$ (0.67)	$ 0.33	$ (0.19)
Discontinued operations	$ (0.69)		$ 0.04		$ 0.40		$ 0.46		$ (0.01)		$ 0.28		$ 0.29		$ 0.33		$ 0.23	$ 0.90	$ (1.03)
Basic earnings per common share	$ (1.64)		$ 0.14		$ 0.42		$ 0.62		$ 0.16		$ 0.43		$ 0.39		$ 0.24		$ (0.44)	$ 1.23	$ (1.22)
Diluted earnings (loss) per common share:
Continuing operations	$ (0.95)		$ 0.10		$ 0.02		$ 0.16		$ 0.17		$ 0.15		$ 0.10		$ (0.09)		$ (0.67)	$ 0.33	$ (0.19)
Discontinued operations	$ (0.69)		$ 0.04		$ 0.40		$ 0.46		$ (0.01)		$ 0.29		$ 0.29		$ 0.33		$ 0.23	$ 0.90	$ (1.03)
Diluted earnings per common share	$ (1.64)		$ 0.14		$ 0.42		$ 0.62		$ 0.16		$ 0.44		$ 0.39		$ 0.24		$ (0.44)	$ 1.23	$ (1.22)
Segment, Discontinued Operations [Member]
Quarterly Financial Information [Line Items]
Net revenues	110,100,000		119,100,000		149,900,000		178,100,000		196,100,000		159,200,000		172,500,000		168,900,000
Gross profit (loss)	(102,600,000)		27,800,000		64,800,000		89,200,000		4,800,000		57,300,000		56,200,000		62,700,000
Australian Well Invention Equipment [Member]
Quarterly Financial Information [Line Items]
Impairment of Long-Lived Assets Held-for-use									6,600,000
Tax benefit related to reorganization									31,300,000
United Kingdom [Member]
Quarterly Financial Information [Line Items]
Net revenues																	345,074,000	275,499,000	198,011,000
Sapura [Member]
Quarterly Financial Information [Line Items]
Other than temporary loss on equity investments									$ 10,600,000

[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.

[3] Excludes gross profit (loss) from discontinued operations of $89.2 million, $64.8 million, $27.8 million and $(102.6) million for the quarters ended March 31, June 30, September 30 and December 31, 2012. Includes impairment charges totaling $14.6 million in the second quarter of 2012, $4.6 million in the third quarter of 2012 and $158.0 million in the fourth quarter of 2012 (Note 2).

[4] Excludes gross profit from discontinued operations of $62.7 million, $56.2 million, $57.3 million and $4.8 million for the quarters ended March 31, June 30, September 30 and December 31, 2011. The fourth quarter includes a $6.6 million impairment charge to reduce our Australian well intervention equipment to its estimated fair value at December 31, 2011.

[5] Our net income in the fourth quarter of 2011 includes a $10.6 million other than temporary impairment loss on our equity investment in our Australian joint venture (Note 5). The fourth quarter also includes a $31.3 million tax benefit related to reorganization of our Australian well intervention operations.

[6] Our net loss in the fourth quarter of 2012 includes a $138.6 million impairment charge associated with the sale of ERT (Note 3).