Debt - Accounts Receivable Securitization (Details) - USD ($)				9 Months Ended
	Dec. 10, 2015	Sep. 11, 2014	Dec. 19, 2012	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016
Line of Credit Facility [Line Items]
Payment of financing costs				$ 1,400,000	$ 1,086,000
Secured Credit Facility
Line of Credit Facility [Line Items]
Debt instrument term			3 years
Maximum borrowing capacity under credit facility		$ 500,000,000	$ 300,000,000
Payment of financing costs	$ 250,000
Basis spread on securitization agreement		0.70%
Commitment fee percentage on unused amount of each lender's commitment		0.30%
Secured Credit Facility | Carrying value
Line of Credit Facility [Line Items]
Amount utilized under securitization facility				$ 0		$ 500,000,000