Noncontrolling Interest Disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		30 Months Ended
	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Noncontrolling Interest Disclosure (Textuals) [Abstract]
Percentage of non-controlling interest		49.00%		49.00%
Purchase price of non-controlling interest for the company				greater of a minimum price of $62,700 or formula price that varies based on operating results
Percentage of share purchased	14.00%
Acquisition of noncontrolling shareholder's interest	$ 17,920	$ 116,500	$ 17,920
Percentage of remaining noncontrolling interest shares		35.00%		35.00%
Right of noncontrolling shareholder to sell its share to the company, Minimum price		$ 44,780		$ 44,780