Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on previously held equity interest on ecoATM	$ 68,376,000			$ 68,376,000
One-time tax benefit		17,800,000
Decrease in effective tax rate				24.40%
ecoATM [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on previously held equity interest on ecoATM	$ 68,376,000
Decrease in effective tax rate	27.00%