Reconciliation of Basic and Diluted Shares (Details 2) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	441	0	0	103
Stock options
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	90	200	101	210
Stock appreciation rights
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,265	372	1,156	453
Performance share units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	322	136	265	78