Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Changes in the restructuring liability
Expensed but not paid	$ 8,020
Cash paid	510
Balance at end of the period	8,530
Severance
Changes in the restructuring liability
Expensed but not paid	1,738
Cash paid	510
Balance at end of the period	2,248
Equity Based Compensation And Professional Fees
Changes in the restructuring liability
Expensed but not paid	1,936
Balance at end of the period	1,936
Product Related and Other
Changes in the restructuring liability
Expensed but not paid	4,346
Balance at end of the period	4,346
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring expenses incurred	10,000
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring expenses incurred	$ 15,000