Earnings per Share, Anti Dilutive Securities (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended							9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	23,101				25,118			21,887	21,402
Dividends per common share (in dollars per share)	$ 0.0625	$ 0.0625	$ 0.0625	$ 0.0575	$ 0.0575	$ 0.0575	$ 0.0575	$ 0.1875	$ 0.1725
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	4,143				13,102			3,759	12,905
Restricted Stock and Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive securities (in shares)	18,958				12,016			18,128	8,497