Restructuring and Related Activities (Details) $ in Thousands		3 Months Ended		16 Months Ended
	Dec. 14, 2015 employee	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee	100
Restructuring Reserve		$ 1,365		$ 1,365	$ 1,566
Restructuring Charges		0	$ 3,344	6,700
Payments for Restructuring		(201)
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		0		0	17
Restructuring Charges				1,100
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		200		200	200
Payments for Restructuring		0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		$ 1,165		1,165	$ 1,349
Restructuring Charges				$ 5,600