Goodwill and Other Intangibles (Acquisitions) (Details) $ in Thousands		12 Months Ended
	Apr. 23, 2014 USD ($) installment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 224,383	$ 224,383
DocTrackr, Inc.
Business Acquisition [Line Items]
Total consideration	$ 10,500
Amount subject to holdback	$ 1,500
Number of installments to release holdback | installment	2
Holdback amount released, initial installment	$ 500
Holdback amount released, second installment	1,000
Net tangible assets	100
Deferred tax liabilities	300
Goodwill	$ 8,500
Weighted average useful life	4 years 8 months 12 days
Developed technology | DocTrackr, Inc.
Business Acquisition [Line Items]
Intangible assets acquired	$ 1,900
Estimated useful life	5 years
Non-compete agreements
Business Acquisition [Line Items]
Estimated useful life		3 years
Non-compete agreements | DocTrackr, Inc.
Business Acquisition [Line Items]
Intangible assets acquired	$ 300
Estimated useful life	3 years