Significant Operations (Revenues Attributable To Major Geographic Areas) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	$ 259,474	$ 294,834
United States [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	162,295	183,748
Asian Countries [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	53,107	62,763
Mexico [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	31,001	32,401
Europe [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	12,702	15,143
Other Countries [Member]
Summary of revenues attributable to the major geographic areas [Abstract]
Total Revenues	$ 369	$ 779