Commitments and Contingencies (Details) - USD ($) $ in Thousands			12 Months Ended
	Sep. 25, 2015	May 23, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2016	Mar. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Operating leases expiration, year			2033
Rent Expense			$ 4,200	$ 4,600	$ 4,000
Loss Contingency Accrual, Payments		$ 1,750
Loss Contingency, Damages Sought, Value	$ 9,800
Loss Contingency Accrual						$ 800	$ 200
Extended tolling agreement for final settlement and release			May 22, 2017