Capital Stock (Details 3) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	0	301	265
Stock options
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	98	188	286
Stock Appreciation Rights (SARs)
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,142	912	1,078
Performance Shares [Member]
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	278	93	0
Other stock-based compensation units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	0	0	101