Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Basic EPS Two Class Method:
Income	$ 6,722	$ 3,028	$ 13,931	$ 6,598	$ 20,939
Income, share amounts	43,369,000	42,862,000	43,268,000	42,768,000
Earnings Per Share, Basic	$ 0.15	$ 0.07	$ 0.32	$ 0.15
Dilutive Securities:
Dilutive Securities, Shares	0	92,000	2,000	158,000
Dilutive RSA's, Shares	192,000	157,000	242,000	207,000
Dilutive RSU's, Shares	51,000	0	87,000	0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ 6,722	$ 3,028	$ 13,931	$ 6,598
Weighted Average Number of Shares Outstanding, Diluted	43,612,000	43,111,000	43,599,000	43,133,000
Earnings Per Share, Diluted	$ 0.15	$ 0.07	$ 0.32	$ 0.15
Stock Options [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	1,600,000	1,300,000	1,500,000	1,000,000
Restricted Stock [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	300,000	500,000	300,000	400,000
Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares			300,000
Contingently Issuable Shares Not Included in Diluted EPS	300,000