Reconciliation of Basic and Diluted Shares (Details 2) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	0	311	0	311
Stock options
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	100	215	107	215
Stock appreciation rights
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,334	968	1,100	968
Performance share units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	350	97	236	97