Basic and Diluted Net Income per Common Share (Schedule of Earnings Per Share Reconciliation) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ 4,795	$ (4,678)	$ 9,913	$ (3,735)
Weighted-average shares outstanding - basic (in shares)	71,689,313	58,498,809	71,681,341	52,865,943
Dilutive securities (in shares)	38,068	222	108,091	31,686
Weighted-average shares outstanding - diluted (in shares)	71,727,381	58,499,031	71,789,432	52,897,629
Common stock equivalent shares excluded due to antidilutive effect (in shares)	3,367,931	381,413	3,367,931	385,350
Basic and diluted:
Net income (loss) per common share (in dollars per share)	$ 0.07	$ (0.08)	$ 0.14	$ (0.07)
Net income (loss) per common share (diluted) (in dollars per share)	$ 0.07	$ (0.08)	$ 0.14	$ (0.07)