Quarterly report pursuant to Section 13 or 15(d)

Escrow Deposits (Details)

v2.4.0.8
Escrow Deposits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 31, 2014
Medium Helicopter [Member]
May 31, 2014
Medium Helicopter [Member]
helicopter
Jun. 30, 2014
Medium Helicopter [Member]
helicopter
Significant Acquisitions and Disposals [Line Items]                
Escrow Deposit $ 0 $ 0 $ 0 $ 0 $ 0      
Number of disposals             2 3
Proceeds from disposition of property and equipment $ 3,400 $ 18,100 $ 6,978 $ 38,492   $ 3,000 $ 6,400