Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 State and Foreign Tax Authorities Minimum	Jun. 30, 2013 State and Foreign Tax Authorities Maximum	Mar. 31, 2013 IRS
Income Tax Examination [Line Items]
Material changes to the total amount of unrecognized tax benefits	$ 0		$ 0
Accrued interest expense	86,000	80,000	165,000	151,000
Gross liability for unrecognized tax benefits	12,100,000		12,100,000
Unrecognized tax benefits that would impact our effective tax rate	7,700,000		7,700,000
Interest included in total liability	3,800,000		3,800,000
Significant increases or decreases for uncertain tax positions	0		0
Period of statute of limitations (years)					3 years	4 years
Estimated interest charges for unfavorable outcome							$ 2,100,000