Restructuring (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring liability		$ 500,000		$ 500,000	$ 100,000	$ 2,400,000
Restructuring expense	$ 0	$ 0	$ 0	0
Payments for Restructuring			$ 100,000	$ 1,900,000