Business Acquisition - (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 03, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisitions
Total revenues		$ 201,194	$ 188,096	$ 356,742	$ 312,186
Net income (loss)		647	$ 117,361	$ 3,086	$ 118,152
Savvy
Business Acquisitions
Acquisition price	$ 42,871
Total revenues		17,500
Net income (loss)		$ (100)