Income Taxes (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in unrecognized tax benefits
Balance, beginning of the year	$ 4,498,000	$ 4,473,000
Additions for tax positions of current year	78,000	2,048,000
Additions for tax positions of prior years	149,000	502,000
Reductions for tax positions of prior years	(3,464,000)
Settlements		(2,525,000)
Balance, end of the year	1,261,000	4,498,000	4,473,000
Portion of Unrecognized tax benefits, if recognized, would impact effective tax rate	700,000	2,900,000
Interest and penalties expense (benefit) relating to uncertain tax positions	(500,000)	(400,000)	200,000
Accrued interest and penalties relating to uncertain tax positions	$ 2,500,000	$ 3,000,000