Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Contract drilling	$ 443,523	$ 599,577
Revenues related to reimbursable expenses	27,020	20,479
Total revenues	470,543	620,056
Operating expenses:
Contract drilling, excluding depreciation	212,841	350,658
Reimbursable expenses	26,791	20,092
Depreciation	104,240	137,299
General and administrative	15,398	17,452
Impairment of assets		358,528
Restructuring and separation costs		6,168
Gain on disposition of assets	(296)	(611)
Total operating expenses	358,974	889,586
Operating income (loss)	111,569	(269,530)
Other income (expense):
Interest income	173	583
Interest expense, net of amounts capitalized	(25,516)	(23,982)
Foreign currency transaction (loss) gain	(3,608)	5,590
Other, net	578	221
Income (loss) before income tax benefit	83,196	(287,118)
Income tax benefit	4,229	31,409
Net income (loss)	$ 87,425	$ (255,709)
Earnings (loss) per share, Basic and Diluted	$ 0.64	$ (1.86)
Weighted-average shares outstanding:
Shares of common stock	137,162	137,151
Dilutive potential shares of common stock	44
Total weighted-average shares outstanding	137,206	137,151
Cash dividends declared per share of common stock		$ 0.125