Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 34,924	$ 27,385
Receivables:
Trade, net of allowance for doubtful accounts	136,161	115,908
Unbilled receivables	38,002	49,535
Insurance recoveries	10,900	8,607
Income taxes and other	5,138	2,310
Deferred income taxes	10,998	13,092
Inventory	14,117	13,232
Assets held for sale	9,909	0
Prepaid expenses and other current assets	8,925	9,311
Total current assets	269,074	239,380
Property and equipment, at cost	1,702,273	1,724,124
Less accumulated depreciation	845,732	786,467
Net property and equipment	856,541	937,657
Intangible assets, net of accumulated amortization	24,223	32,194
Noncurrent deferred income taxes	2,753	1,156
Other long-term assets	18,998	19,236
Total assets	1,171,589	1,229,623
Current liabilities:
Accounts payable	64,305	43,718
Current portion of long-term debt	27	2,847
Deferred revenues	3,315	699
Accrued expenses:
Payroll and related employee costs	40,058	30,020
Insurance premiums and deductibles	12,829	10,940
Insurance claims and settlements	10,900	8,607
Interest	5,432	12,275
Other	10,326	11,727
Total current liabilities	147,192	120,833
Long-term debt, less current portion	455,053	499,666
Noncurrent deferred income taxes	69,578	84,636
Other long-term liabilities	4,702	6,055
Total liabilities	676,525	711,190
Commitments and contingencies (Note 12)
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; 63,820,126 and 62,534,636 shares outstanding at December 31, 2014 and 2013, respectively	6,414	6,275
Additional paid-in capital	472,457	456,812
Treasury stock, at cost; 317,103 and 219,304 shares at December 31, 2014 and 2013, respectively	(3,030)	(1,895)
Accumulated earnings	19,223	57,241
Total shareholders' equity	495,064	518,433
Total liabilities and shareholders' equity	$ 1,171,589	$ 1,229,623