Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basic and diluted earnings per share computation
Net income (loss) available to common stockholders, basic and diluted	$ 19,444	$ (19,048)	$ 54,758	$ 3,123
Average outstanding shares - basic	71,933,141	71,915,073	71,925,664	71,915,073
Add: dilutive stock options and awards	40,844		97
Average outstanding shares - diluted	71,973,985	71,915,073	71,925,761	71,915,073
Basic earnings (loss) per share	$ 0.27	$ (0.27)	$ 0.76	$ 0.04
Diluted earnings (loss) per share	$ 0.27	$ (0.27)	$ 0.76	$ 0.04
Earnings Per Share (Textual) [Abstract]
Options excluded from the diluted average outstanding share calculation			903,945	1,597,959