Condensed Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 6,291	$ 86,197
Receivables:
Trade, net of allowance for doubtful accounts	129,496	106,084
Unbilled receivables	35,976	31,512
Insurance recoveries	6,302	5,470
Income taxes	1,761	2,168
Deferred income taxes	16,109	15,433
Inventory	12,177	11,184
Prepaid expenses and other current assets	10,019	11,564
Total current assets	218,131	269,612
Property and equipment, at cost	1,631,847	1,336,926
Less accumulated depreciation	649,123	542,970
Net property and equipment	982,724	793,956
Intangible assets, net of accumulated amortization of $22,174 and $17,397 as of September 30, 2012 and December 31, 2011, respectively	46,020	52,680
Goodwill	41,683	41,683
Noncurrent deferred income taxes	373	735
Other long-term assets	14,253	14,088
Total assets	1,303,184	1,172,754
Current liabilities:
Accounts payable	84,919	66,440
Current portion of long-term debt	872	872
Prepaid drilling contracts	2,880	3,966
Accrued expenses:
Payroll and related employee costs	27,464	29,057
Insurance premiums and deductibles	10,418	10,583
Insurance claims and settlements	6,302	5,470
Interest	1,842	12,283
Other	12,935	11,009
Total current liabilities	147,632	139,680
Long-term debt, less current portion	498,502	418,728
Noncurrent deferred income taxes	107,727	94,745
Other long-term liabilities	6,988	9,156
Total liabilities	760,849	662,309
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock, 10,000,000 shares authorized; none issued and outstanding	0	0
Common stock $.10 par value; 100,000,000 shares authorized; 62,028,941 shares and 61,782,180 shares outstanding at September 30, 2012 and December 31, 2011, respectively	6,216	6,188
Additional paid-in capital	447,767	442,020
Treasury stock, at cost; 134,188 shares and 95,409 shares at September 30, 2012 and December 31, 2011, respectively	(1,261)	(904)
Accumulated earnings	89,613	63,141
Total shareholders' equity	542,335	510,445
Total liabilities and shareholders' equity	$ 1,303,184	$ 1,172,754