Restructuring Charges - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) employee	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 345	$ 61
2014 Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated (employee) | employee	290
Total Incurred and Anticipated Charges	$ 27,000
Restructuring charge	0
Employee Severance and Termination | 2014 Plan
Restructuring Cost and Reserve [Line Items]
Total Incurred and Anticipated Charges	20,000
Restructuring charge	0
Professional Fees, Office Closures and Other | 2014 Plan
Restructuring Cost and Reserve [Line Items]
Total Incurred and Anticipated Charges	7,000
Restructuring charge	0
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring charge	300
Contract Termination | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 800		$ 700