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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

The following table presents the number of shares or units outstanding for each award type as of June 30, 2015 and December 31, 2014, respectively, (in thousands):



Award type	June 30, 2015	December 31, 2014
Stock options	868	961
Restricted stock units (time based)	2,104	1,830
Restricted stock units (performance based)	32	34
Stock appreciation rights	606	673
Market stock units	563	444

Market Stock Units Valuation Assumptions [Table Text Block]

The weighted average assumptions used to value the MSUs granted during the three and six months ended June 30, 2015 were as follows:




		June 30, 2015
Volatility		42.06%
Risk-free interest rate		0.89%
Expected option life in years		2.95
Dividend yield		—