Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (106,840)	$ 9,555
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	115,528	137,398
Allowance for doubtful accounts	(358)	408
Gain on dispositions of property and equipment	(2,639)	(1,589)
Stock-based compensation expense	2,275	5,761
Amortization of debt issuance costs, discount and premium	1,737	2,193
Gain on sale of fishing and rental services operations	0	(10,702)
Loss on extinguishment of debt	0	22,482
Impairment charges	79,648	678
Deferred income taxes	(15,048)	5,395
Change in other long-term assets	438	8,247
Change in other long-term liabilities	(509)	(1,385)
Changes in current assets and liabilities:
Receivables	113,686	(29,428)
Inventory	1,533	(1,094)
Prepaid expenses and other current assets	3,233	3,030
Accounts payable	(29,547)	11,802
Deferred revenues	11,457	2,545
Accrued expenses	(35,529)	(10,366)
Net cash provided by operating activities	139,065	154,930
Cash flows from investing activities:
Purchases of property and equipment	(130,390)	(120,738)
Proceeds from sale of fishing and rental services operations	0	15,090
Proceeds from sale of property and equipment	37,803	7,197
Proceeds from insurance recoveries	227	0
Net cash used in investing activities	(92,360)	(98,451)
Cash flows from financing activities:
Debt repayments	(45,003)	(360,019)
Proceeds from issuance of debt	0	320,000
Debt issuance costs	(999)	(9,173)
Tender premium costs	0	(15,381)
Proceeds from exercise of options	781	8,280
Purchase of treasury stock	(729)	(1,132)
Net cash used in financing activities	(45,950)	(57,425)
Net increase (decrease) in cash and cash equivalents	755	(946)
Beginning cash and cash equivalents	34,924	27,385
Ending cash and cash equivalents	35,679	26,439
Supplementary disclosure:
Interest paid	21,543	41,188
Income tax paid	2,659	3,475
Noncash investing and financing activity:
Change in capital expenditure accruals	$ 308	$ 9,840