Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 276,686	$ 156,233
Accounts receivable, net of allowance for bad debts	271,390	247,028
Prepaid expenses and other current assets	97,803	102,146
Assets held for sale	2,598	400
Total current assets	648,477	505,807
Drilling and other property and equipment, net of accumulated depreciation	5,432,689	5,726,935
Other assets	117,062	139,135
Total assets	6,198,228	6,371,877
Current liabilities:
Accounts payable	33,301	30,242
Accrued liabilities	140,233	182,159
Taxes payable	7,436	23,898
Short-term borrowings		104,200
Total current liabilities	180,970	340,499
Long-term debt	1,971,852	1,980,884
Deferred tax liability	124,929	197,011
Other liabilities	115,715	103,349
Total liabilities	2,393,466	2,621,743
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock (par value $0.01, 25,000,000 shares authorized, none issued and outstanding)
Common stock (par value $0.01, 500,000,000 shares authorized; 144,084,644 shares issued and 137,227,309 shares outstanding at September 30, 2017; 143,997,757 shares issued and 137,169,663 shares outstanding at December 31, 2016)	1,441	1,440
Additional paid-in capital	2,009,953	2,004,514
Retained earnings	1,996,438	1,946,765
Accumulated other comprehensive (loss) gain	(3)	1
Treasury stock, at cost (6,857,335 and 6,828,094 shares of common stock at September 30, 2017 and December 31, 2016, respectively)	(203,067)	(202,586)
Total stockholders' equity	3,804,762	3,750,134
Total liabilities and stockholders' equity	$ 6,198,228	$ 6,371,877