Commitments and Contingencies (Narrative) (Details)			1 Months Ended		3 Months Ended
	Oct. 01, 2014	Sep. 23, 2014 USD ($)	Dec. 31, 2015 USD ($) building	Mar. 31, 2012 USD ($)	Dec. 31, 2015 USD ($) building	Dec. 31, 2014 USD ($)	Nov. 30, 2014 building
Loss Contingencies [Line Items]
Operating leases, rent expense					$ 300,000	$ 400,000
Fair value assumptions, credit adjusted risk-free rate, range minimal amount			3.25%		3.25%
Fair value assumptions, credit adjusted risk-free rate, range maximum amount			4.20%		4.20%
Accretion expense					$ 15,000	16,000
Gain from change in estimate on ARO obligation					2,879,000
Decrease (increase) in property, plant, and equipment					2,100,000
Asset retirement obligation, revision in estimated cash flows					0	$ 845,000
Business combination, indemnification assets, range of outcomes, value				$ 3,400,000.0
Business combination, indemnification duration, period taken into account for				2 years
Payments to terminate lease agreement			$ 200,000		200,000
Reduction in ARO					$ (300,000)
Document Period End Date					Dec. 31, 2015
Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 47,500,000
Buildings [Member] | Property Subject to Operating Lease [Member]
Loss Contingencies [Line Items]
Number of leased buildings | building			6		6
Leases retroactively effective | building							4
Lease term	3 years
Operating lease, term extension, option to extend	3 years