Commitments and Other Contingencies - Unallocated Severance-related Costs (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 2,904
Payments for restructuring			3,953
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2,072
Payments for restructuring			3,121
General and Administrative Expense | One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,314		$ 486
General and Administrative Expense | Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		$ 2,732