Restructuring Charges - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended	15 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 394	$ 675	$ 739	$ 736
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 100		500
Contract Termination | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring charge			$ 700		$ 700
2014 Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated (employee) | employee						290
Restructuring costs incurred for the 2014 plan						$ 27,000
2014 Plan | Employee Severance and Termination
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred for the 2014 plan						20,000
2014 Plan | Professional Fees, Office Closures and Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred for the 2014 plan						$ 7,000