Segment Information (Financial information for Company's segments) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 506,029,000	$ 326,225,000	$ 1,377,033,000	$ 1,095,629,000
Cost of services and rentals (exclusive of depreciation, depletion, amortization, and accretion)	368,279,000	258,168,000	1,042,067,000	802,142,000
Depreciation, depletion, amortization and accretion	108,751,000	123,308,000	331,151,000	392,017,000
General and administrative expenses	74,372,000	86,743,000	226,573,000	270,467,000
Reduction in value of assets	9,953,000	0	9,953,000	462,461,000
Loss from operations	(55,326,000)	(141,994,000)	(232,711,000)	(831,458,000)
Interest income (expense), net	(29,096,000)	(21,771,000)	(76,679,000)	(68,325,000)
Other expense	(970,000)	3,667,000	(2,477,000)	22,103,000
Loss from continuing operations before income taxes	(85,392,000)	(160,098,000)	(311,867,000)	(877,680,000)
Identifiable Assets	3,211,131,000		3,211,131,000		$ 3,470,255,000
Technical Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	83,085,000	64,093,000	205,562,000	230,640,000
Cost of services and rentals (exclusive of depreciation, depletion, amortization, and accretion)	48,387,000	40,466,000	126,944,000	135,385,000
Depreciation, depletion, amortization and accretion	8,262,000	10,881,000	25,297,000	34,342,000
General and administrative expenses	17,509,000	23,476,000	52,362,000	69,600,000
Reduction in value of assets	8,115,000		8,115,000
Loss from operations	812,000	(10,730,000)	(7,156,000)	(8,687,000)
Interest income (expense), net	926,000	870,000	2,627,000	2,669,000
Loss from continuing operations before income taxes	1,738,000	(9,860,000)	(4,529,000)	(6,018,000)
Identifiable Assets	428,117,000		428,117,000		448,499,000
Production Services [Member]
Segment Reporting Information [Line Items]
Revenues	97,333,000	77,523,000	254,544,000	267,389,000
Cost of services and rentals (exclusive of depreciation, depletion, amortization, and accretion)	78,074,000	66,000,000	210,778,000	210,823,000
Depreciation, depletion, amortization and accretion	19,606,000	23,131,000	60,905,000	72,959,000
General and administrative expenses	17,441,000	19,712,000	50,113,000	61,214,000
Reduction in value of assets				226,061,000
Loss from operations	(17,788,000)	(31,320,000)	(67,252,000)	(303,668,000)
Interest income (expense), net		(17,000)		(1,330,000)
Loss from continuing operations before income taxes	(17,788,000)	(31,337,000)	(67,252,000)	(304,998,000)
Identifiable Assets	531,809,000		531,809,000		598,909,000
Onshore Completion and Workover Services [Member]
Segment Reporting Information [Line Items]
Revenues	248,405,000	125,022,000	702,463,000	373,387,000
Cost of services and rentals (exclusive of depreciation, depletion, amortization, and accretion)	210,103,000	124,747,000	610,154,000	363,447,000
Depreciation, depletion, amortization and accretion	48,828,000	51,346,000	144,090,000	158,885,000
General and administrative expenses	22,931,000	23,124,000	73,522,000	68,250,000
Reduction in value of assets	1,838,000		1,838,000	188,741,000
Loss from operations	(35,295,000)	(74,195,000)	(127,141,000)	(405,936,000)
Loss from continuing operations before income taxes	(35,295,000)	(74,195,000)	(127,141,000)	(405,936,000)
Identifiable Assets	1,564,596,000		1,564,596,000		1,573,801,000
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Revenues	77,206,000	59,587,000	214,464,000	224,213,000
Cost of services and rentals (exclusive of depreciation, depletion, amortization, and accretion)	31,715,000	26,955,000	94,191,000	92,487,000
Depreciation, depletion, amortization and accretion	32,055,000	37,950,000	100,859,000	125,831,000
General and administrative expenses	16,491,000	20,431,000	50,576,000	71,403,000
Reduction in value of assets				47,659,000
Loss from operations	(3,055,000)	(25,749,000)	(31,162,000)	(113,167,000)
Loss from continuing operations before income taxes	(3,055,000)	(25,749,000)	(31,162,000)	(113,167,000)
Identifiable Assets	686,609,000		686,609,000		$ 849,046,000
Unallocated [Member]
Segment Reporting Information [Line Items]
Interest income (expense), net	(30,022,000)	(22,624,000)	(79,306,000)	(69,664,000)
Other expense	(970,000)	3,667,000	(2,477,000)	22,103,000
Loss from continuing operations before income taxes	$ (30,992,000)	$ (18,957,000)	$ (81,783,000)	$ (47,561,000)