Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies [Line Items]
Net rental expense	$ 2,200	$ 2,100	$ 2,200
Future Obligations for Minimum Rentals Under Non-Cancelable Operating Lease Commitments
2016	2,134
2017	2,193
2018	1,969
2019	1,888
2020	1,796
Thereafter	9,492
Total lease commitments	$ 19,472
Minimum [Member]
Commitments and Contingencies [Line Items]
Lease term for facilities	5 years
Maximum [Member]
Commitments and Contingencies [Line Items]
Lease term for facilities	10 years
Lease terms for equipment	5 years