Acquisitions (Tables)

12 Months Ended

Dec. 31, 2018

Business Acquisition [Line Items]

Schedule of unaudited supplemental pro forma results present consolidated information

	Year Ended
	December 31,
(In thousands, except per share amounts)	2017		2016
Operating revenues	$	2,717,933	$	2,362,576
Income (loss) from continuing operations, net of tax		(554,235)		(1,129,172)
Income (loss) from continuing operations per share - basic	$	(1.75)	$	(3.59)
Income (loss) from continuing operations per share - diluted	$	(1.75)	$	(3.59)

Tesco Corporation

Business Acquisition [Line Items]

Allocation of purchase price as of the acquisition date

	Fair Value
(In thousands)	at Acquisition
Assets:
Cash and cash equivalents	$	59,804
Accounts receivable		40,465
Inventory		44,525
Other current assets		13,889
Property, plant and equipment		68,591
Other long-term assets		3,647
Total assets		230,921
Liabilities:
Accounts payable	$	14,111
Accrued liabilities		35,383
Other long-term liabilities		2,436
Total liabilities		51,930
Net assets acquired	$	178,991