Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes [Abstract]

Schedule Of Components Of Income And Loss From Continuing Operations Before Income Taxes

	Years ended December 31,
	2016		2015		2014
Domestic	$	(1,097,109)	$	(2,069,019)	$	372,672
Foreign		(3,232)		9,236		69,517
	$	(1,100,341)	$	(2,059,783)	$	442,189

Schedule Of Components Of Income Tax Expense (Benefit)

	Years ended December 31,
	2016		2015		2014
Current:
Federal	$	(101,578)	$	(952)	$	150,997
State		(159)		2,818		11,339
Foreign		19,156		19,227		36,287
		(82,581)		21,093		198,623
Deferred:
Federal		(179,721)		(249,193)		(33,172)
State		(9,348)		(10,034)		648
Foreign		4,649		(13,886)		(4,700)
		(184,420)		(273,113)		(37,224)
	$	(267,001)	$	(252,020)	$	161,399

Schedule Of Effective Income Tax Rate Reconciliation

	Years ended December 31,
	2016		2015		2014
Computed expected tax expense (benefit)	$	(385,119)	$	(720,923)	$	154,766
Increase (decrease) resulting from
State and foreign income taxes		(8,038)		(6,353)		8,467
Reduction in value of assets		115,725		464,395		-
Other		10,431		10,861		(1,834)
Income tax expense (benefit)	$	(267,001)	$	(252,020)	$	161,399

Schedule Of Deferred Tax Assets and Liabilities

	December 31,
	2016		2015
Deferred tax assets:
Allowance for doubtful accounts	$	9,172	$	8,275
Operating loss and tax credit carryforwards		85,383		92,798
Compensation and employee benefits		59,351		59,310
Decommissioning liabilities		40,994		30,400
Other		51,069		57,768
		245,969		248,551
Valuation allowance		(6,722)		(5,395)
Net deferred tax assets		239,247		243,156
Deferred tax liabilities:
Property, plant and equipment		352,683		469,728
Notes receivable		14,796		14,796
Goodwill and other intangible assets		98,868		119,661
Other		16,511		22,040
Deferred tax liabilities		482,858		626,225
Net deferred tax liability	$	243,611	$	383,069

Summary Of Activity In Unrecognized Tax Benefits

	Years ended December 31,
	2016		2015		2014
Unrecognized tax benefits,
December 31, 2015, 2014 and 2013, respectively	$	29,715	$	30,344	$	29,899
Additions based on tax positions related to prior years		6,874		6,752		7,860
Reductions based on tax positions related to prior years		(3,582)		-		(5,438)
Reductions as a result of a lapse of the applicable statute of limitations		(3,051)		-		(1,977)
Reductions relating to settlements with taxing authorities		-		(7,381)		-
Unrecognized tax benefits,
December 31, 2016, 2015 and 2014, respectively	$	29,956	$	29,715	$	30,344