Earnings Per Common Share (Computation Of Basic And Diluted Net Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income (loss)	$ (22,182)	$ 13,790	$ 6,378	$ 41,677
Basic earnings per common share, Income (Numerator)	(22,182)	13,790	6,378	41,677
Basic earnings per common share, Shares (Denominator)	70,671	69,706	70,479	68,926
Basic earnings per common share (dollars per share)	$ (0.31)	$ 0.20	$ 0.09	$ 0.60
Effect of dilutive securities, Options, Shares	0	825	734	832
Effect of dilutive securities, Options, (dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted earnings per common share, Income (Numerator)	$ (22,182)	$ 13,790	$ 6,378	$ 41,677
Diluted earnings per common share, Shares (Denominator)	70,671	70,531	71,213	69,758
Diluted earnings per common share (dollars per share)	$ (0.31)	$ 0.20	$ 0.09	$ 0.60
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share, Shares		547	827	548
Antidilutive securities excluded from earnings per share, average exercise price (dollars per share)		$ 23.50	$ 26.32	$ 23.50