Schedule II (Details) - Valuation and Qualifying Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]
Beginning balance	$ 9,931	$ 7,208	$ 4,359
Charged to costs and expenses	7,059	5,727	4,751
Deductions	(4,803)	(3,004)	(1,656)
Acquisitions			(246)
Ending balance	$ 12,187	$ 9,931	$ 7,208