Indemnification Obligations (Narrative) (Details) - Indemnification Agreement [Member] - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Loss contingency accrued	$ 0	$ 0
Source Photonics [Member]
Loss Contingencies [Line Items]
Days in excess of statute of limitations	90 days
Indemnification obligation deductible	$ 1,000,000
Maximum [Member] | Source Photonics [Member]
Loss Contingencies [Line Items]
Indemnification obligation maximum possible loss	$ 20,000,000