Quarterly Financial Information - Cost of Sales Reclassification (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information (Unaudited)
Cost of Sales from products	$ 111,627	$ 155,516	$ 113,399
Cost of Sales from services	$ 84,453	$ 73,111	$ 57,233

The aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.

No definition available.

Name:	us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration