Revolving Credit Facility & Bank Borrowings (Long-Term Bank Borrowings) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Debt outstanding	[1]	$ 6,375	$ 11,646
Current maturities	[1]	$ 4,772	5,288
PNC [Member]
Number of notes payable outstanding | item		5
Minimum interest rate on long-term debt		2.45%
Maximum interest rate on long-term debt		2.79%
Long-term debt interest capitalized		$ 0	$ 400

[1] As the interest rate of each credit agreement is variable, typically based on the daily LIBOR rates plus an additional margin, the estimated fair value of each debt instrument approximates its carrying value.