Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits
Balance as of beginning of period	$ 56,601,000	$ 99,230,000	$ 111,594,000
Additions for current year tax positions	2,367,000	1,904,000	3,240,000
Additions for tax positions of prior years	214,000	403,000	948,000
Reductions for tax positions of prior years	(396,000)	(1,618,000)	(1,492,000)
Reductions due to lapses of applicable statutes of limitations	(28,606,000)	(43,297,000)	(15,011,000)
Reductions due to settlements with taxing authorities	(4,000)	(21,000)	(49,000)
Balance as of end of period	30,176,000	56,601,000	99,230,000
Unrecognized tax benefits realized that would have reduced income tax expense	23,300,000	45,100,000
Accrued interest and penalties related to unrecognized tax benefits	1,500,000	2,700,000
Interest and penalties recorded	$ (1,200,000)	$ (100,000)	$ (900,000)