Annual report pursuant to Section 13 and 15(d)

INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Dart Narrative (Details)

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INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Dart Narrative (Details) (USD $)
12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dart Helicopter Services LLC and Dart Holding Company Ltd. [Member]
Products Purchased [Member]
Dec. 31, 2012
Dart Helicopter Services LLC and Dart Holding Company Ltd. [Member]
Products Purchased [Member]
Dec. 31, 2011
Dart Helicopter Services LLC and Dart Holding Company Ltd. [Member]
Products Purchased [Member]
Dec. 31, 2013
Dart Helicopter Services LLC [Member]
Feb. 28, 2011
Dart Helicopter Services LLC [Member]
Dec. 31, 2009
Dart Helicopter Services LLC [Member]
Equity Method Investee [Member]
Dec. 31, 2013
Dart Helicopter Services LLC [Member]
Era DHS LLC [Member]
Jul. 31, 2011
Dart Holding Company Ltd. [Member]
Jul. 31, 2011
Dart Holding Company Ltd. [Member]
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]                  
Ownership       50.00%     49.00% 50.00%  
Notes receivable to related party           $ 300,000     $ 5,100,000
Notes receivable interest rate           5.00%     4.00%
Additional investment         5,000,000        
Expenses from transactions with related party $ 2,900,000 $ 1,700,000 $ 2,300,000