CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 761,423	$ 484,228
Receivables - trade and other	550,416	410,519
Prepaid expenses and other current assets	30,294	26,528
Total current assets	1,342,133	921,275
PROPERTY AND EQUIPMENT:
Drilling equipment	8,961,689	8,930,434
Other property and equipment	137,680	137,659
Property and equipment - gross	9,099,369	9,068,093
Less accumulated depreciation and amortization	1,844,436	1,662,261
Property and equipment - net	7,254,933	7,405,832
Other assets	22,595	20,160
TOTAL ASSETS	8,619,661	8,347,267
CURRENT LIABILITIES:
Accounts payable - trade	109,644	109,574
Deferred revenues	23,619	33,062
Accrued liabilities	174,883	186,035
Total current liabilities	308,146	328,671
Long-term debt, less current portion	2,645,367	2,692,419
Other liabilities	348,676	357,923
Deferred income taxes - net	190,680	195,795
Commitments and contingent liabilities (Note 4)
SHAREHOLDERS' EQUITY:
Class A Ordinary Shares, $0.125 par value, 125,974,717 and 125,947,424 shares issued at June 30, 2016, and December 31, 2015	15,747	15,743
Additional paid-in capital	1,463,297	1,458,532
Retained earnings	3,849,354	3,509,792
Cost of 556,139 and 1,129,440 treasury shares at June 30, 2016, and December 31, 2015, respectively	(7,251)	(12,223)
Accumulated other comprehensive loss	(194,355)	(199,385)
Total shareholders' equity	5,126,792	4,772,459
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,619,661	$ 8,347,267