Reconciliation of Basic and Diluted Shares (Details 2) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	957	0	694	0
Stock options
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	90	100	90	107
Stock appreciation rights
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,641	1,334	1,364	1,100
Performance share units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	835	350	572	236