Goodwill and Intangible Assets (Details - Other Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Intangible Assets Other Details [Abstract]
Amortization of intangible assets	$ 5,100,000	$ 8,900,000	$ 8,900,000	$ 8,900,000	$ 8,900,000	$ 9,500,000	$ 9,200,000	$ 8,800,000	$ 31,799,000	$ 36,405,000	$ 31,461,000
Amortization of acquisition costs of acquired entity									0	8,400,000	37,100,000
Amortization of intangible assets	5,100,000	8,900,000	8,900,000	8,900,000	8,900,000	9,500,000	9,200,000	8,800,000	31,799,000	36,405,000	31,461,000
Percentage of voting interests acquired	100.00%								100.00%
Consideration paid to acquire 100% of the outstanding shares	$ 72,000,000								$ 72,000,000