Fair Value of Financial Instruments (Other Investments - Pensare) (Narrative) (Details) - Pensare [Member] $ / shares in Units, warrant in Millions, $ in Millions		3 Months Ended
	Mar. 31, 2019 warrant $ / shares	Sep. 30, 2017 USD ($)
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity investment and warrants, amount paid (in dollars) | $		$ 2.0
Equity investment, ownership percentage	4.00%
Derivative instruments, number held | warrant	2.0
Plan [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Warrants, exercise price (in dollars per share) | $ / shares	$ 11.50
Plan [Member] | Common Stock [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Investment, restriction period (in years)	1 year