Equity Investments (Investments Accounted For By The Equity Method) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 206,690	$ 86,824
Tatex Thailand II, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	319	1,030
Tatex Thailand III, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	8,683	8,282
Grizzly Oil Sands ULC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	164,974	69,008
Bison Drilling And Field Services LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	14,109	6,366
Muskie Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	5,840	2,138
Timber Wolf Terminals LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	952
Windsor Midstream LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	7,928
Stingray Pressure Pumping LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	3,599
Stingray Cementing LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments	286
Blackhawk Midstream LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments