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Property and Equipment (Additional Disclosures) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation expense, inclusive of expense captured in cost of revenue	$ 13,100,000us-gaap_Depreciation	$ 11,200,000us-gaap_Depreciation	$ 9,500,000us-gaap_Depreciation
Impairment related to property and equipment	$ 0	$ 0	$ 0

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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