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FAIR VALUE MEASUREMENTS (Details) (USD $)
9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Days
Years
Sep. 30, 2010
Dec. 31, 2010
Jun. 10, 2011
Peak Energy Services Ltd.'s ('Peak')
Sep. 30, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2011
Significant Other Observable Inputs (Level 2)
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Significant Other Observable Inputs (Level 2)
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3)
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2010
Significant Unobservable Inputs (Level 3)
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3)
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2010
Significant Unobservable Inputs (Level 3)
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Significant Unobservable Inputs (Level 3)
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis               
Auction rate securities$ 4,239,000 $ 5,437,000     $ 4,239,000 $ 4,239,000 $ 5,437,000$ 4,239,000$ 5,437,000
Marketable securities93,000 3,174,000 93,0003,174,000       93,0003,174,000
Percentage of outstanding common shares of acquiree already owned by company (as a percent)   3.15%           
Interest rate, resetting days (in days)28              
Temporary decline in fair value of securities(500,000)              
Unrealized pre-tax gain (loss) on auction rate securities(200,000)200,000             
Changes in the entity's auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)               
Balance at the beginning of the period        5,311,0005,315,0005,437,0006,503,000   
Sale of auction rate securities        (1,000,000) (1,000,000)(1,300,000)   
Unrealized (losses) gains included in other comprehensive income        (72,000)115,000(198,000)227,000   
Balance at the end of the period        $ 4,239,000$ 5,430,000$ 4,239,000$ 5,430,000