CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 595,200	$ 484,228
Receivables - trade and other	426,909	410,519
Prepaid expenses and other current assets	19,735	26,528
Total current assets	1,041,844	921,275
PROPERTY, PLANT AND EQUIPMENT:
Drilling equipment	8,951,655	8,930,434
Other property and equipment	137,763	137,659
Property, plant and equipment - gross	9,089,418	9,068,093
Less accumulated depreciation and amortization	1,757,294	1,662,261
Property, plant and equipment - net	7,332,124	7,405,832
Other assets	18,159	20,160
TOTAL ASSETS	8,392,127	8,347,267
CURRENT LIABILITIES:
Current portion of long-term debt	21,278	0
Accounts payable - trade	87,071	109,574
Deferred revenues	30,523	33,062
Accrued liabilities	160,385	186,035
Total current liabilities	299,257	328,671
Long-term debt, less current portion	2,655,043	2,692,419
Other liabilities	352,398	357,923
Deferred income taxes - net	$ 185,396	$ 195,795
Commitments and contingent liabilities
SHAREHOLDERS' EQUITY:
Class A Ordinary Shares, $0.125 par value, 125,947,424 shares issued at March 31, 2016, and December 31, 2015	$ 15,743	$ 15,743
Additional paid-in capital	1,456,998	1,458,532
Retained earnings	3,632,596	3,509,792
Cost of 702,275 and 1,129,440 treasury shares at March 31, 2016, and December 31, 2015, respectively	(8,434)	(12,223)
Accumulated other comprehensive loss	(196,870)	(199,385)
Total shareholders' equity	4,900,033	4,772,459
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,392,127	$ 8,347,267