Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 20,810	$ 27,385
Restricted Cash	210,401	0
Receivables:
Trade, net of allowance for doubtful accounts	121,790	115,908
Unbilled receivables	44,792	49,535
Insurance recoveries	9,657	8,607
Income taxes and other	6,493	2,310
Deferred income taxes	11,569	13,092
Inventory	13,750	13,232
Prepaid expenses and other current assets	6,610	9,311
Total current assets	445,872	239,380
Property and equipment, at cost	1,740,920	1,724,124
Less accumulated depreciation	813,991	786,467
Net property and equipment	926,929	937,657
Intangible assets, net of accumulated amortization of $34.3 million and $32.8 million at March 31, 2014 and December 31, 2013, respectively	30,272	32,269
Noncurrent deferred income taxes	4,020	1,156
Other long-term assets	19,284	19,161
Total assets	1,426,377	1,229,623
Current liabilities:
Accounts payable	53,969	43,718
Current portion of long-term debt	202,166	2,847
Deferred revenues	2,159	699
Accrued expenses:
Payroll and related employee costs	24,586	30,020
Insurance premiums and deductibles	10,896	10,940
Insurance claims and settlements	9,657	8,607
Interest	2,057	12,275
Other	10,898	11,727
Total current liabilities	316,388	120,833
Long-term debt, less current portion	501,133	499,666
Noncurrent deferred income taxes	84,596	84,636
Other long-term liabilities	6,706	6,055
Total liabilities	908,823	711,190
Commitments and contingencies (Note 7)
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; 62,740,394 and 62,534,636 shares outstanding at March 31, 2014 and December 31, 2013, respectively	6,301	6,275
Additional paid-in capital	458,919	456,812
Treasury stock, at cost; 270,777 and 219,304 shares at March 31, 2014 and December 31, 2013, respectively	(2,328)	(1,895)
Accumulated earnings	54,662	57,241
Total shareholders' equity	517,554	518,433
Total liabilities and shareholders' equity	$ 1,426,377	$ 1,229,623