Reconciliation of Basic and Diluted Shares (Details 2) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	430	0
Stock options
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	90	114
Stock appreciation rights
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,088	864
Performance share units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	309	122