Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Basic EPS Two Class Method:
Income	$ 8,886	$ 3,122	$ 22,817	$ 9,720	$ 20,939
Income, share amounts	43,389,000	42,901,000	43,308,000	42,812,000
Earnings Per Share, Basic	$ 0.20	$ 0.07	$ 0.53	$ 0.23
Dilutive Securities:
Dilutive Securities, Shares	0	70,000	0	133,000
Dilutive RSA's, Shares	288,000	268,000	249,000	213,000
Dilutive RSU's, Shares	27,000	0	67,000	0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ 8,886	$ 3,122	$ 22,817	$ 9,720
Weighted Average Number of Shares Outstanding, Diluted	43,704,000	43,239,000	43,624,000	43,158,000
Earnings Per Share, Diluted	$ 0.20	$ 0.07	$ 0.52	$ 0.23
Stock Options [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	1,600,000	1,400,000	1,600,000	1,100,000
Restricted Stock [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	200,000	400,000	300,000	400,000
Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares			400,000
Contingently Issuable Shares Not Included in Diluted EPS	400,000