Sale of F&R Services Operations (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 17, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 17, 2014	Dec. 31, 2013
Significant Acquisitions and Disposals [Line Items]
Proceeds from sale of fishing and rental services operations				$ 15,090,000	$ 0
Gain on sale of fishing and rental services operations		10,702,000	0	10,702,000	0
Fishing and Rental Services
Significant Acquisitions and Disposals [Line Items]
Total Consideration Received on Divestiture of Business	16,100,000
Proceeds from sale of fishing and rental services operations	15,100,000
Escrow Deposits Related to Property Sales	1,000,000
Net book value of tools and equipment						4,300,000
Gain on sale of fishing and rental services operations	10,700,000
Gain from sale, net of taxes	6,600,000
Disposal group revenues as percentage of consolidated revenues (percent)				1.00%
Disposal group pretax income as percentage of consolidated pretax income (percent)				1.00%
Disposal group total assets as percentage of total assets (percent)				1.00%
Balance sheet information [Abstract]
Current assets							1,877,000
Property and equipment, less accumulated depreciation							6,132,000
Total assets							8,009,000
Current liabilities							919,000
Long term liabilities							1,452,000
Total liabilities							2,371,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues		2,603,000	3,072,000	7,828,000	9,627,000
Operating costs		1,686,000	2,082,000	5,097,000	6,217,000
F&R margin		917,000	990,000	2,731,000	3,410,000
Income (loss) before income taxes		$ 52,000	$ (51,000)	$ (162,000)	$ 238,000