Summary of Significant Accounting Policies Net income (Loss) Per Common Share (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Call Options and Warrants	0
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted Average Number of Shares Outstanding, Basic	198,912,000	190,860,000	175,662,000
Impact of Common Stock Equivalents	746,000	537,000	281,000
Weighted Average Number of Shares Outstanding, Diluted	199,658,000	191,397,000	175,943,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5,200,000	5,500,000	6,300,000
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			5,500,000