Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income (loss)	$ 9,555	$ (33,417)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization	137,398	141,047
Allowance for doubtful accounts	408	534
Gain on dispositions of property and equipment	(1,589)	(865)
Stock-based compensation expense	5,761	4,692
Amortization of debt issuance costs, discount and premium	2,193	2,309
Gain on sale of fishing and rental services operations	(10,702)	0
Loss on extinguishment of debt	22,482	0
Impairment charges	678	54,292
Deferred income taxes	5,395	(21,153)
Change in other long-term assets	8,247	(5,554)
Change in other long-term liabilities	(1,385)	(1,306)
Changes in current assets and liabilities:
Receivables	(29,428)	(21,353)
Inventory	(1,094)	(620)
Prepaid expenses and other current assets	3,030	7,330
Accounts payable	11,802	(379)
Deferred revenues	2,545	(2,973)
Accrued expenses	(10,366)	(12,509)
Net cash provided by operating activities	154,930	110,075
Cash flows from investing activities:
Purchases of property and equipment	(120,738)	(137,945)
Proceeds from sale of fishing and rental services operations	15,090	0
Proceeds from sale of property and equipment	7,197	6,898
Net cash used in investing activities	(98,451)	(131,047)
Cash flows from financing activities:
Debt repayments	(360,019)	(25,868)
Proceeds from issuance of debt	320,000	40,000
Debt issuance costs	(9,173)	(13)
Tender premium costs	(15,381)	0
Proceeds from exercise of options	8,280	833
Purchase of treasury stock	(1,132)	(628)
Net cash provided by (used in) financing activities	(57,425)	14,324
Net decrease in cash and cash equivalents	(946)	(6,648)
Beginning cash and cash equivalents	27,385	23,733
Ending cash and cash equivalents	26,439	17,085
Supplementary disclosure:
Interest paid	41,188	45,273
Income tax paid	$ 3,475	$ 2,508