Basic and Diluted Net Income per Common Share (Schedule of Earnings Per Share Reconciliation) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net (loss) income	$ (4,678)	$ 46,424	$ (3,735)	$ 48,120
Weighted-average shares outstanding - basic	58,498,809	47,172,103	52,865,943	47,156,700
Dilutive securities	222	364,683	31,686	238,658
Weighted-average shares outstanding - diluted	58,499,031	47,536,786	52,897,629	47,395,358
Common stock equivalent shares excluded due to antidilutive effect	381,413	32,399	385,350	32,399
Basic and diluted:
Net (loss) income per common share	$ (0.08)	$ 0.98	$ (0.07)	$ 1.02
Net (loss) income per common share (diluted)	$ (0.08)	$ 0.98	$ (0.07)	$ 1.02