(Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net (Loss) Earnings	$ (951)	$ 11,792	$ 18,892	$ 33,110
Denominator:
Basic - Weighted Average Shares Outstanding	17,941,171	18,120,729	18,139,314	18,201,291
Effect of dilutive securities:
Share-based compensation plans	0	514,558	478,717	526,527
Diluted - Weighted Average Shares Outstanding	17,941,171	18,635,287	18,618,031	18,727,818
Basic (Loss) Earnings per Share	$ (0.05)	$ 0.65	$ 1.04	$ 1.82
Diluted (Loss) Earnings per Share	$ (0.05)	$ 0.63	$ 1.01	$ 1.77
Anti-dilutive securities excluded from earnings per share calculation	746,206	81,874	242,874	85,765