Accounting Policies - Earnings Per Share Anti-Dilutive (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Stock Options and SARs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share (shares)	89,937	1,270,777	46,969	[1]	469,577	[1]
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share (shares)	44,894	146,311	35,097	[1]	92,800	[1]

[1] For the six months ended June 30, 2013 and 2012, stock options and SARs of 46,969 and 469,577, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because they were anti-dilutive. For the six months ended June 30, 2013 and 2012, contingent shares of non-vested restricted stock of 35,097 and 92,800, respectively, were outstanding but not included in the computation of diluted earnings per share of common stock because performance conditions were not met.