Unconsolidated companies summarized financial data (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Summarized financial data for OEH's unconsolidated companies
Current assets	$ 64,145		$ 75,339
Property, plant and equipment, net	342,731		333,374
Other assets	24,142		25,072
Non-current assets	366,873		358,446
Total assets	431,018		433,785
Current liabilities	154,213		165,413
Long-term debt	37,043		45,985
Other liabilities	127,002		115,763
Non-current liabilities	164,045		161,748
Total shareholders’ equity	112,760		106,624
Total liabilities and shareholders’ equity	431,018		433,785
Revenue	168,839		157,270		145,254
Gross profit	91,357	[1]	89,303	[1]	82,600	[1]
Net earnings	$ 13,549	[2]	$ 4,181	[2]	$ 7,694	[2]

[1] Gross profit is defined as revenues less cost of services of the unconsolidated companies.

[2] There were no discontinued operations, extraordinary items or cumulative effects of a change in an accounting principle in the unconsolidated companies.