Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator (both basic and diluted):
Net income (loss) available to common stockholders	$ (18,808)	$ 9,931	$ 2,443	$ (1,907)	$ (7,399)	$ (6,956)	$ (12,797)	$ (8,777)	$ (8,341)	$ (35,929)	$ 19,586
Denominator:
Denominator for basic earnings per share	41,332,000	41,477,000	41,342,000	40,605,000	40,253,000	40,400,000	40,336,000	39,885,000	41,165,940	40,288,218	40,505,555
Stock options											167,986
Unvested restricted stock											601,752
Denominator for diluted earnings per share	41,332,000	42,213,000	42,043,000	40,605,000	40,253,000	40,400,000	40,336,000	39,885,000	41,165,940	40,288,218	41,275,293
Basic earnings (loss) per common share	$ (0.46)	$ 0.24	$ 0.06	$ (0.05)	$ (0.18)	$ (0.17)	$ (0.32)	$ (0.22)	$ (0.20)	$ (0.89)	$ 0.48
Diluted earnings (loss) per common share	$ (0.46)	$ 0.24	$ 0.06	$ (0.05)	$ (0.18)	$ (0.17)	$ (0.32)	$ (0.22)	$ (0.20)	$ (0.89)	$ 0.47