Earnings Per Common Share (EPS) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share, Basic and Diluted [Abstract]
Net Income, Basic EPS									$ 19,710	$ 23,044	$ 12,460
Shares, Basic EPS									42,176	39,086	35,290
Basic (in dollars per share)	$ 0.02	$ 0.17	$ 0.14	$ 0.14	$ 0.12	$ 0.11	$ 0.19	$ 0.19	$ 0.47	$ 0.59	$ 0.35
Effect of dilutive stock options and warrants									434	647	686
Net Income, Diluted EPS									$ 19,710	$ 23,044	$ 12,460
Shares, Diluted EPS									42,610	39,733	35,976
Diluted (in dollars per share)	$ 0.01	$ 0.17	$ 0.14	$ 0.14	$ 0.12	$ 0.11	$ 0.18	$ 0.18	$ 0.46	$ 0.58	$ 0.35
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									1,588	909	878