Earnings (loss) Per Common Share (Reconciliation of Earnings (loss) Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Basic
Net income (loss)	$ 14,172	$ (6,035)
Weighted-average shares, outstanding	61,578	53,968
Income (loss) per share	$ 0.23	$ (0.11)
Diluted
Net income (loss)	14,172	(6,035)
Effect of dilutive securities	0	0
Net income (loss) available to common shareholders after assumed conversion	$ 14,172	$ (6,035)
Weighted average shares:
Weighted-average shares, outstanding	61,578	53,968
Diluted effect of stock options, restricted stock, and restricted stock unit awards	1,069	0
Weighted-average shares, Diluted	62,647	53,968
Income (loss) per share	$ 0.23	$ (0.11)