Business Combinations (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 10, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Total consideration transferred	$ 17,980
Assets acquired:
Accounts receivable	67
Prepaid expenses and other current assets	3,963
Property and equipment	252
Intangible assets	16,000
Total assets acquired	20,282
Liabilities assumed:
Deferred revenue	(750)
Deferred tax liabilities	(563)
Total liabilities assumed	(1,313)
Total net assets acquired	18,969
Bargain purchase gain	$ 989	$ 989	$ 0	$ 0