Earnings per Share - Anti Dilutive Securities (Details) - $ / shares shares in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	44,819		43,537	45,565	44,170
Dividends per common share (in dollars per share)	$ 0.0775	$ 0.0775	$ 0.07	$ 0.1550	$ 0.14
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	1,944		2,590	1,930	2,384
Restricted Stock and Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	15,909		13,981	16,669	14,820
Convertible preferred stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	26,966		26,966	26,966	26,966