Long-Term Debt (Narrative) (Details) (USD $) In Thousands, unless otherwise specified										9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Sep. 30, 2014 Foreign Credit Facility [Member]	Dec. 31, 2013 Foreign Credit Facility [Member]	Jun. 30, 2014 Term Facility [Member]	Sep. 30, 2014 Accordion Feature [Member]	Sep. 30, 2014 Foreign Financial Institutions [Member] Letter Of Credit [Member]	Dec. 31, 2013 Foreign Financial Institutions [Member] Letter Of Credit [Member]	Sep. 30, 2014 Government Entity And Other Financial Institutions [Member]	Sep. 30, 2014 Minimum [Member] Government Entity And Other Financial Institutions [Member]	Sep. 30, 2014 Maximum [Member] Government Entity And Other Financial Institutions [Member]
Line Of Credit Facility And Long Term Debt [Line Items]
Monthly payments											$ 0	$ 3
Line of credit facility, amount outstanding		0	10,320	7,308	997	8,954		0	340
Credit facility maximum borrowing capacity	$ 30,000						$ 10,000
Interest rate range, minimum										0.75%
Interest rate range, maximum										5.50%