Property and Equipment - Additional Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Property, Plant and Equipment [Abstract]
Depreciation expense, inclusive of expense captured in cost of revenue	$ 3.4	$ 3.4	$ 6.8	$ 6.4