Goodwill and Intangible Assets - Acquired and Amortization (Details) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Acquired identifiable intangible assets
Acquired identifiable intangible assets, net of accumulated amortization	$ 11,324	$ 2,685
Non-competition agreements
Acquired identifiable intangible assets
Acquired identifiable intangible assets, net of accumulated amortization	328	80
Accumulated amortization	3,865	3,821
Customer relationships
Acquired identifiable intangible assets
Acquired identifiable intangible assets, net of accumulated amortization	10,996	2,605
Accumulated amortization	$ 5,524	$ 5,181