Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net Earnings (Loss)	$ 11,477	$ (951)	$ 31,244	$ 18,892
Denominator:
Basic - Weighted Average Shares Outstanding	17,498,808	17,941,171	17,516,941	18,139,314
Effect of dilutive securities:
Share-based compensation plans	474,398	0	438,558	478,717
Diluted - Weighted Average Shares Outstanding	17,973,206	17,941,171	17,955,499	18,618,031
Basic Earnings (Loss) per Share	$ 0.66	$ (0.05)	$ 1.78	$ 1.04
Diluted Earnings (Loss) per Share	$ 0.64	$ (0.05)	$ 1.74	$ 1.01
Anti-dilutive securities excluded from earnings per share calculation	313,711	746,206	382,075	242,874