Restructuring Charges - Changes in 2014 Plan Restructuring Liabilities (Details) - 2014 Plan $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Restructuring Reserve [Roll Forward]
Restructuring liability, as of January 1, 2016	$ 2,781
Cash paid	(1,660)
Foreign exchange rate changes	40
Restructuring liability, as of June 30, 2016	1,161
Employee Severance and Termination
Restructuring Reserve [Roll Forward]
Restructuring liability, as of January 1, 2016	1,791
Cash paid	(1,660)
Foreign exchange rate changes	40
Restructuring liability, as of June 30, 2016	171
Professional Fees, Office Closures and Other
Restructuring Reserve [Roll Forward]
Restructuring liability, as of January 1, 2016	990
Cash paid	0
Foreign exchange rate changes	0
Restructuring liability, as of June 30, 2016	$ 990