Earnings Per Share (Computation Of Basic And Diluted Earnings (Loss) 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 (both basic and diluted):
Net income (loss)	$ (105,642)	$ 9,931	$ (186,561)	$ 10,467
Denominator:
Denominator for basic earnings (loss) per share	40,168,406	41,477,139	40,458,557	41,103,660
Stock options		83,790		109,914
Unvested restricted stock		651,984		540,780
Denominator for diluted earnings (loss) per share	40,168,406	42,212,913	40,458,557	41,754,354
Basic earnings (loss) per common share:	$ (2.63)	$ 0.24	$ (4.61)	$ 0.25
Diluted earnings (loss) per common share:	$ (2.63)	$ 0.24	$ (4.61)	$ 0.25