Earnings Per Share (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Basic earnings per share:
Income (loss) from continuing operations attributable to common shareholders (in dollars per share)	$ 0.22	$ (0.07)
Loss from discontinued operations (in dollars per share)		$ (0.01)
Earnings (loss) per share - basic (in dollars per share)	$ 0.22	$ (0.08)
Diluted earnings per share:
Income (loss) from continuing operations attributable to common shareholders (in dollars per share)	$ 0.22	$ (0.07)
Loss from discontinued operations (in dollars per share)		$ (0.01)
Earnings (loss) per share - diluted (in dollars per share)	$ 0.22	$ (0.08)
Performance shares and restricted stock units	1,003,000
Options to purchase shares of common stock outstanding excluded from computation of diluted earnings per share due to its antidilutive effect	0	0