Commitments and Contingencies (Additional Information) (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 14, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense		$ 7,100	$ 6,600	$ 6,200
Deferred rent credit, noncurrent		400	$ 500
Operating Leased Assets [Line Items]
Total lease commitments		$ 41,397
Standby letters of credit for headquarters
Operating Leased Assets [Line Items]
Maximum borrowing capacity	$ 1,200
Lease agreement for headquarters
Operating Leased Assets [Line Items]
Lease term	10 years
Total lease commitments	$ 38,600