Revenue Recognition (Details)	3 Months Ended
	Mar. 31, 2015
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Typical service agreements	12 months
Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Typical service agreements termination notice period	30 days
Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Typical service agreements termination notice period	90 days