Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Leased assets	$ 2,859	$ 5,387
Accumulated amortization of leased assets	2,760	2,264
Proceeds from the sale of property, plant and equipment	303	936
Gain (loss) on sale of assets, excluding deferred gain recognized	(632)	489
Sale Leaseback Agreement
Property, Plant and Equipment [Line Items]
Leased assets	13,900	14,700
Accumulated amortization of leased assets	2,900	1,600
Sale Leaseback Agreement | CFI NNN Raiders | Capital Lease Obligations
Property, Plant and Equipment [Line Items]
Amortization related to deferred gain recognized from sale of real estate	$ 168	$ 168